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CO, USA
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Posted: 1/4/2022 1:33:38 PM EDT
[#1]
Quote HistoryOriginally Posted By Chokey:
FUCK. YES. I’m honestly shocked at how smoothly this has all gone so far. If they get to full completion without any anomalies then every single delay and increase of cost will have been worth it |
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Posted: 1/4/2022 1:38:02 PM EDT
[#2]
Quote HistoryOriginally Posted By Rudukai13: FUCK. YES. I’m honestly shocked at how smoothly this has all gone so far. If they get to full completion without any anomalies then every single delay and increase of cost will have been worth it Quote HistoryOriginally Posted By Rudukai13: Originally Posted By Chokey:
FUCK. YES. I’m honestly shocked at how smoothly this has all gone so far. If they get to full completion without any anomalies then every single delay and increase of cost will have been worth it yeah at this point, the other stuff should work |
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Posted: 1/4/2022 1:40:27 PM EDT
[#3]
next step
 webb mirror |
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Posted: 1/4/2022 1:46:04 PM EDT
[#4]
I'm most excited about the ability to determine atmospheric composition of exoplanets.
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Posted: 1/4/2022 1:46:48 PM EDT
[#5]
Quote HistoryOriginally Posted By midcap: You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. |
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Posted: 1/4/2022 1:48:55 PM EDT
[#6]
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Posted: 1/4/2022 2:16:16 PM EDT
[#7]
Quote Historythis is THE step, no secondary mirror no telescope |
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Posted: 1/4/2022 2:25:41 PM EDT
[#8]
Quote HistoryOriginally Posted By midcap: that would be awesome to see all those stars at night. You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Quote HistoryOriginally Posted By midcap: Originally Posted By DK-Prof: Originally Posted By midcap: Originally Posted By Rudukai13: Originally Posted By midcap: Originally Posted By SecretSquirell: Originally Posted By slanted: Originally Posted By Rudukai13: People are trying to understand a non-localized non-propagating event (BB) by comparing it to a localized propagating event (our sun). The difference was actually explained fairly well in the most recent The Expanse novels: Stars, like our sun, emit energy locally in our universe and that energy propagates outward from that single point. Imagine dropping a pebble into a pool - it creates a ripple, and that ripple moves outward in all directions away from that localized point. This is a localized, propagating event. This is how light and gravity work in our universe. The creation of the universe (Big Bang) was a non-local, non-propagating event. Picture the pool that you previously dropped a pebble into, except now instead of a pebble you drop a sheet of glass the same size as the surface of the pool. Every point on the surface of the pool is affected all at the same time. This is what's meant by a non-local, non-propagating event. You can't see the sheet of glass striking the surface where you are right now because it happened in the past, but if you look far enough to the light that originated on the other side of the pool you should still be able to see the surface disruption just after the event occurred. That's what they're trying to do with JWST I get it, instead of watching a jar of tannerite explode, we are in the jar  A jar 13 billion light years across. That lit off all at once. Really want to screw with your brain? The observable universe is ~93 billion light-years in diameter. then you really really want to mess with your brain...what is on the outside of that? Yeah  Universe is fucking crazy manThe other night it was clear...like really clear...I cupped my hands over my eyes and I was able to see the faint stars in the back ground. It was heavy man Lots of people have no idea what "clear" means until they have been in places with very little light pollution on a clear and moon-less night. I remember being in the Coral Sea, and on a remote island off the coast of Fiji - the sheer volume of stars you could see is amazing. Even Kauai and the Big Island are amazing (there's a reason all those observatories were built on Mauna Kea). My wife and I are planning the design of the house we are going to build on the Big Island, and we're talking about some kind of deck/platform on the top of the house, purely for star-gazing. I think I might pick up astrophotography as a hobby when I retire.  that would be awesome to see all those stars at night. You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Try West Texas sometime. Driving out I-10 at night is a trip. |
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Posted: 1/4/2022 2:29:14 PM EDT
[#9]
I'm not incredibly familiar with the history of cosmology.
How long have we been saying that the Universe began with the Big Bang, and that it's 13.8 Billion years old? And when did that theory arise? |
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Posted: 1/4/2022 2:40:49 PM EDT
[#10]
Quote HistoryOriginally Posted By DK-Prof: Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. Quote HistoryOriginally Posted By DK-Prof: Originally Posted By midcap: You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. Where I live in AZ, it's much easier to find spots with excellent skies for imaging with my telescope. https://www.lightpollutionmap.info/#zoom=3.75&lat=40.6097&lon=-90.3490&layers=B0FFFFFFFTFFFFFFFFFF  Attached File |
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Posted: 1/4/2022 2:44:12 PM EDT
[#11]
Quote HistoryOriginally Posted By TacticalGarand44: I'm not incredibly familiar with the history of cosmology. How long have we been saying that the Universe began with the Big Bang, and that it's 13.8 Billion years old? And when did that theory arise? https://spaceplace.nasa.gov/big-bang/en/ |
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Posted: 1/4/2022 2:44:27 PM EDT
[#12]
Quote HistoryOriginally Posted By AZ_Sky: The East half of the USA kind of sucks when it comes to light pollution. Where I live in AZ, it's much easier to find spots with excellent skies for imaging with my telescope. https://www.lightpollutionmap.info/#zoom=3.75&lat=40.6097&lon=-90.3490&layers=B0FFFFFFFTFFFFFFFFFF https://www.ar15.com/media/mediaFiles/20962/LPUSA_JPG-2228259.JPG Quote HistoryOriginally Posted By AZ_Sky: Originally Posted By DK-Prof: Originally Posted By midcap: You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. Where I live in AZ, it's much easier to find spots with excellent skies for imaging with my telescope. https://www.lightpollutionmap.info/#zoom=3.75&lat=40.6097&lon=-90.3490&layers=B0FFFFFFFTFFFFFFFFFF https://www.ar15.com/media/mediaFiles/20962/LPUSA_JPG-2228259.JPG That huge flare in ND makes me sad. The Bakken oil fields. Makes a place with extremely low population glow like New York City. |
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Posted: 1/4/2022 2:47:54 PM EDT
[#13]
Quote HistoryQuote HistoryOriginally Posted By johnh57: Originally Posted By TacticalGarand44: I'm not incredibly familiar with the history of cosmology. How long have we been saying that the Universe began with the Big Bang, and that it's 13.8 Billion years old? And when did that theory arise? https://spaceplace.nasa.gov/big-bang/en/ So Hubble determined that more distant galaxies were red shifted more. How did he know they were more distant? Parallax only works on very short distance scales, relatively speaking. On the order of tens of thousands of light years. |
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Posted: 1/4/2022 3:17:41 PM EDT
[#14]
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Posted: 1/4/2022 3:53:22 PM EDT
[#15]
Quote HistoryOriginally Posted By DK-Prof: Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. Quote HistoryOriginally Posted By DK-Prof: Originally Posted By midcap: You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. yeah man....I think people need to see that stuff more often. It really puts you into perspective. |
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Posted: 1/4/2022 3:54:47 PM EDT
[#16]
Quote HistoryOriginally Posted By snakes19: this is THE step, no secondary mirror no telescope Quote HistoryOriginally Posted By snakes19: this is THE step, no secondary mirror no telescope yeah no lie... |
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Posted: 1/4/2022 4:13:15 PM EDT
[#17]
Quote HistoryOriginally Posted By TacticalGarand44: So Hubble determined that more distant galaxies were red shifted more. How did he know they were more distant? Parallax only works on very short distance scales, relatively speaking. On the order of tens of thousands of light years. Quote HistoryOriginally Posted By TacticalGarand44: Originally Posted By johnh57: Originally Posted By TacticalGarand44: I'm not incredibly familiar with the history of cosmology. How long have we been saying that the Universe began with the Big Bang, and that it's 13.8 Billion years old? And when did that theory arise? https://spaceplace.nasa.gov/big-bang/en/ So Hubble determined that more distant galaxies were red shifted more. How did he know they were more distant? Parallax only works on very short distance scales, relatively speaking. On the order of tens of thousands of light years. He used the period-luminosity relationship for Cepheid variables from the work of Henrietta Swan Leavitt. Her work laid the foundation for Hubble, and he said as much. |
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Posted: 1/4/2022 4:20:27 PM EDT
[#18]
Quote HistoryOriginally Posted By exDefensorMilitas: He used the period-luminosity relationship for Cepheid variables from the work of Henrietta Swan Leavitt. Her work laid the foundation for Hubble, and he said as much. Quote HistoryOriginally Posted By exDefensorMilitas: Originally Posted By TacticalGarand44: Originally Posted By johnh57: Originally Posted By TacticalGarand44: I'm not incredibly familiar with the history of cosmology. How long have we been saying that the Universe began with the Big Bang, and that it's 13.8 Billion years old? And when did that theory arise? https://spaceplace.nasa.gov/big-bang/en/ So Hubble determined that more distant galaxies were red shifted more. How did he know they were more distant? Parallax only works on very short distance scales, relatively speaking. On the order of tens of thousands of light years. He used the period-luminosity relationship for Cepheid variables from the work of Henrietta Swan Leavitt. Her work laid the foundation for Hubble, and he said as much. I remember Cepheid variables from my study, but not their relevance to cosmology. Any good reading to recommend? |
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Posted: 1/4/2022 4:26:33 PM EDT
[#19]
Quote HistoryOriginally Posted By midcap: yeah man....I think people need to see that stuff more often. It really puts you into perspective. Quote HistoryOriginally Posted By midcap: Originally Posted By DK-Prof: Originally Posted By midcap: You can get some good skies when you go offshore fishing at night in the GOM as long as you are away from the oil rigs Oh yeah, I bet that is REALLY nice. It's really cool when you can just CLEARLY see the entire Milky Way across the sky, and you realize the "haze" of the disc is hundreds of billions of stars, and that lots of the "stars" you see in the sky are actually individual galaxies as well, each with their own hundreds of billions of stars. Mind-blowing and awesome. yeah man....I think people need to see that stuff more often. It really puts you into perspective. After the blackouts from the 1994 Northridge earthquake a bunch of people called 911 about the strange clouds in the sky. It was the Milky Way, which none of them had ever seen before. Those years of delay on launching JWST are worth it if everything works. There's a reason they re-engineered things after test failures. |
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Posted: 1/4/2022 4:39:09 PM EDT
[Last Edit: AZ_Sky]
[#20]
Quote HistoryOriginally Posted By TacticalGarand44: I remember Cepheid variables from my study, but not their relevance to cosmology. Any good reading to recommend? Now you have me going down the Cepheid distance measuring 'rabbit hole', as I was unaware of how all that actually worked. I tripped over this short piece on the web and now I have a very simplistic understanding of how Cepheid brightness in conjunction with parallax measurements works (sort of). Fascinating stuff!!!  https://earthsky.org/brightest-stars/delta-cephei-the-kings-famous-variable-star/ https://www.atnf.csiro.au/outreach/education/senior/astrophysics/variable_cepheids.html |
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Posted: 1/4/2022 9:21:24 PM EDT
[#21]
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Posted: 1/4/2022 9:40:31 PM EDT
[#22]
Quote HistoryOriginally Posted By DK-Prof: Lots of people have no idea what "clear" means until they have been in places with very little light pollution on a clear and moon-less night. I remember being in the Coral Sea, and on a remote island off the coast of Fiji - the sheer volume of stars you could see is amazing. Even Kauai and the Big Island are amazing (there's a reason all those observatories were built on Mauna Kea). My wife and I are planning the design of the house we are going to build on the Big Island, and we're talking about some kind of deck/platform on the top of the house, purely for star-gazing. I think I might pick up astrophotography as a hobby when I retire. Quote HistoryOriginally Posted By DK-Prof: Originally Posted By midcap: Originally Posted By Rudukai13: Originally Posted By midcap: Originally Posted By SecretSquirell: Originally Posted By slanted: Originally Posted By Rudukai13: People are trying to understand a non-localized non-propagating event (BB) by comparing it to a localized propagating event (our sun). The difference was actually explained fairly well in the most recent The Expanse novels: Stars, like our sun, emit energy locally in our universe and that energy propagates outward from that single point. Imagine dropping a pebble into a pool - it creates a ripple, and that ripple moves outward in all directions away from that localized point. This is a localized, propagating event. This is how light and gravity work in our universe. The creation of the universe (Big Bang) was a non-local, non-propagating event. Picture the pool that you previously dropped a pebble into, except now instead of a pebble you drop a sheet of glass the same size as the surface of the pool. Every point on the surface of the pool is affected all at the same time. This is what’s meant by a non-local, non-propagating event. You can’t see the sheet of glass striking the surface where you are right now because it happened in the past, but if you look far enough to the light that originated on the other side of the pool you should still be able to see the surface disruption just after the event occurred. That’s what they’re trying to do with JWST I get it, instead of watching a jar of tannerite explode, we are in the jar A jar 13 billion light years across. That lit off all at once. Really want to screw with your brain? The observable universe is ~93 billion light-years in diameter. then you really really want to mess with your brain...what is on the outside of that? Yeah Universe is fucking crazy manThe other night it was clear...like really clear...I cupped my hands over my eyes and I was able to see the faint stars in the back ground. It was heavy man Lots of people have no idea what "clear" means until they have been in places with very little light pollution on a clear and moon-less night. I remember being in the Coral Sea, and on a remote island off the coast of Fiji - the sheer volume of stars you could see is amazing. Even Kauai and the Big Island are amazing (there's a reason all those observatories were built on Mauna Kea). My wife and I are planning the design of the house we are going to build on the Big Island, and we're talking about some kind of deck/platform on the top of the house, purely for star-gazing. I think I might pick up astrophotography as a hobby when I retire. I found myself in this situation while camping in Colorado this year... 10k up surrounded by mountains and national park... I thought I had seen clear nights in Ohio but holy shit I couldn't get enough of the sky out there. |
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Posted: 1/4/2022 9:52:36 PM EDT
[#23]
Quote HistoryOriginally Posted By AJE: I found myself in this situation while camping in Colorado this year... 10k up surrounded by mountains and national park... I thought I had seen clear nights in Ohio but holy shit I couldn't get enough of the sky out there. Colorado lost a lot of dark sky from what I saw as a kid and what it is now... I thought I seen a lot of stars in the desert till I was out on a sailboat in the middle of the Caribbean. holy cow what a sight. |
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CO, USA
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Posted: 1/4/2022 11:41:33 PM EDT
[#24]
Quote HistoryOriginally Posted By RED_5: has anyone posted this yet? LEGO JWST https://ideascdn.lego.com/media/generate/lego_ci/fc87d976-24b4-4aa8-8e01-c3214636398e/resize:1600:900/webp Hell yeah. How do we tell LEGO to make it yesterday? |
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Posted: 1/5/2022 12:32:28 AM EDT
[#25]
Quote HistoryOriginally Posted By WI_Bill: 9.7 billion and what will be the return, other than curiosity? You know... other than that... cool desktop wall paper. |
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Posted: 1/5/2022 1:08:04 AM EDT
[#26]
As a kid I spent a few years at GITMO. Not much light pollution then and the Cubans had even fewer lights. There was basically no TV so the main thing to do was go to the movies. All the theaters were outdoors and we were lucky to have one down the street.
I’d usually spend the time staring at the stars. So many and from horizon to horizon it seemed. My father would point out passing satellites on occasion. Really haven’t seen anything like it since. I can understand the ancients fascination with astronomy. It was the best show in town! |
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CO, USA
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Posted: 1/5/2022 4:20:31 AM EDT
[#27]
I expect to wake up to some good news |
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Posted: 1/5/2022 4:25:52 AM EDT
[#28]
Quote HistoryOriginally Posted By Rudukai13:
I expect to wake up to some good news |
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CO, USA
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Posted: 1/5/2022 12:14:42 PM EDT
[#29]
Currently in progress |
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Posted: 1/5/2022 12:42:55 PM EDT
[#30]
Quote HistoryOriginally Posted By midcap: The other night it was clear...like really clear...I cupped my hands over my eyes and I was able to see the faint stars in the back ground. It was heavy man You need a PVS-14. |
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Posted: 1/5/2022 12:54:21 PM EDT
[#31]
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Posted: 1/5/2022 1:05:20 PM EDT
[#32]
Quote HistoryOriginally Posted By flcroc: You need a PVS-14. I've used mine to look at stars. It works so well making dim stars bright that the image is overwhelming useless. 
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CO, USA
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Posted: 1/5/2022 2:25:27 PM EDT
[#33]
Quote HistoryOriginally Posted By Chokey:
Quote HistoryOriginally Posted By Chokey:
FUCK YEAH  Webb's secondary mirror is fully deployed. Webb's secondary mirror had to deploy in microgravity, and in extremely cold temperatures, and it ultimately had to work the first time without error. It also had to deploy, position, and lock itself into place to a tolerance of about one and a half millimeters, and then it has to stay extremely stable while the telescope points to different places in the sky – and that’s all for a secondary mirror support structure that is over 7 meters in length. Webb's secondary mirror is at the end of the Secondary Mirror Support Structure (SMSS). The secondary mirror plays an important role in reflecting the light from the primary mirror to where the instruments sit, behind the primary mirror. I’m pretty sure that means that, even if every other deployment beyond this point fails, JWST is now a functional observatory! |
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Posted: 1/5/2022 2:35:21 PM EDT
[#34]
As with anything else not across the finish line, I don't want to jinx shit by sighing any kind of relief
. I'm happy everything has worked well so far.
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Posted: 1/5/2022 2:37:23 PM EDT
[#35]
Quote HistoryOriginally Posted By Rudukai13: FUCK YEAH https://webb.nasa.gov/content/webbLaunch/assets/images/deployment/1000pxWide/117.png I’m pretty sure that means that, even if every other deployment beyond this point fails, JWST is now a functional observatory! Quote HistoryOriginally Posted By Rudukai13: Originally Posted By Chokey:
FUCK YEAH https://webb.nasa.gov/content/webbLaunch/assets/images/deployment/1000pxWide/117.png Webb's secondary mirror is fully deployed. Webb's secondary mirror had to deploy in microgravity, and in extremely cold temperatures, and it ultimately had to work the first time without error. It also had to deploy, position, and lock itself into place to a tolerance of about one and a half millimeters, and then it has to stay extremely stable while the telescope points to different places in the sky – and that’s all for a secondary mirror support structure that is over 7 meters in length. Webb's secondary mirror is at the end of the Secondary Mirror Support Structure (SMSS). The secondary mirror plays an important role in reflecting the light from the primary mirror to where the instruments sit, behind the primary mirror. I’m pretty sure that means that, even if every other deployment beyond this point fails, JWST is now a functional observatory! As long as the main mirror panels can adequately align without the side wings(no idea if those have to deploy to allow alignment i.e it's all tied together, all or nothing), theoretically JWST would be functional although diminished in light gathering capability. |
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Posted: 1/5/2022 2:40:56 PM EDT
[#36]
Quote HistoryOriginally Posted By exDefensorMilitas: As long as the main mirror panels can adequately align without the side wings(no idea if those have to deploy to allow alignment i.e it's all tied together, all or nothing), theoretically JWST would be functional although diminished in light gathering capability. Quote HistoryOriginally Posted By exDefensorMilitas: Originally Posted By Rudukai13: Originally Posted By Chokey:
FUCK YEAH https://webb.nasa.gov/content/webbLaunch/assets/images/deployment/1000pxWide/117.png Webb's secondary mirror is fully deployed. Webb's secondary mirror had to deploy in microgravity, and in extremely cold temperatures, and it ultimately had to work the first time without error. It also had to deploy, position, and lock itself into place to a tolerance of about one and a half millimeters, and then it has to stay extremely stable while the telescope points to different places in the sky – and that’s all for a secondary mirror support structure that is over 7 meters in length. Webb's secondary mirror is at the end of the Secondary Mirror Support Structure (SMSS). The secondary mirror plays an important role in reflecting the light from the primary mirror to where the instruments sit, behind the primary mirror. I’m pretty sure that means that, even if every other deployment beyond this point fails, JWST is now a functional observatory! As long as the main mirror panels can adequately align without the side wings(no idea if those have to deploy to allow alignment i.e it's all tied together, all or nothing), theoretically JWST would be functional although diminished in light gathering capability. it was designed to work if the side panels did not deploy correctly, obviously not as well as with them deployed but it would still be the best telescope out there without them |
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Posted: 1/5/2022 2:51:23 PM EDT
[#37]
Quote HistoryOriginally Posted By snakes19: it was designed to work if the side panels did not deploy correctly, obviously not as well as with them deployed but it would still be the best telescope out there without them Quote HistoryOriginally Posted By snakes19: Originally Posted By exDefensorMilitas: Originally Posted By Rudukai13: Originally Posted By Chokey:
FUCK YEAH https://webb.nasa.gov/content/webbLaunch/assets/images/deployment/1000pxWide/117.png Webb's secondary mirror is fully deployed. Webb's secondary mirror had to deploy in microgravity, and in extremely cold temperatures, and it ultimately had to work the first time without error. It also had to deploy, position, and lock itself into place to a tolerance of about one and a half millimeters, and then it has to stay extremely stable while the telescope points to different places in the sky – and that’s all for a secondary mirror support structure that is over 7 meters in length. Webb's secondary mirror is at the end of the Secondary Mirror Support Structure (SMSS). The secondary mirror plays an important role in reflecting the light from the primary mirror to where the instruments sit, behind the primary mirror. I’m pretty sure that means that, even if every other deployment beyond this point fails, JWST is now a functional observatory! As long as the main mirror panels can adequately align without the side wings(no idea if those have to deploy to allow alignment i.e it's all tied together, all or nothing), theoretically JWST would be functional although diminished in light gathering capability. it was designed to work if the side panels did not deploy correctly, obviously not as well as with them deployed but it would still be the best telescope out there without them Ok. I figured it was as that would be an obvious contingency. Just hadn't done any digging to confirm that. |
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Posted: 1/5/2022 2:52:19 PM EDT
[Last Edit: ArGyLe64]
[#38]
When will it reach it's lagrange point? Or is it there already? I thought it was going to take some time to get out to L2.
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Posted: 1/5/2022 2:59:42 PM EDT
[#39]
Quote HistoryOriginally Posted By ArGyLe64: When will it reach it's lagrange point? Or is it there already? I thought it was going to take some time to get out to L2. https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html |
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IN, USA
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Posted: 1/5/2022 3:02:06 PM EDT
[Last Edit: Zephri]
[#40]
I must be the only one who was disappointed when I saw the milky way, I thought it was clouds or just the usual smoke from wild fires states away. Friend said that's the milky way and I said that's it, lame.
That being said I can't wait to see the pictures from this telescope. |
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Posted: 1/5/2022 3:06:15 PM EDT
[#41]
Quote HistoryQuote HistoryOriginally Posted By usptac: Originally Posted By ArGyLe64: When will it reach it's lagrange point? Or is it there already? I thought it was going to take some time to get out to L2. https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html It's 2/3 of the way there, but it's only moving about as fast as a .45-70 now. Still some 18 days to go to get out to its l2 orbit. |
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CO, USA
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Posted: 1/5/2022 3:17:26 PM EDT
[#42]
According to their nominal deployment sequence, the only steps remaining are deployment of the aft radiator and the primary mirror wings:
 James Webb Space Telescope Deployment Sequence (Nominal) They’ll also have to focus the primary mirrors, but I think that’s considerably less nerve wracking than the other deployments. Then it’s just a matter of time, distance, and cooling |
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Posted: 1/5/2022 4:06:14 PM EDT
[#43]
Awesome thread guys. It now has it’s own tab on my screen!
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Posted: 1/5/2022 4:19:03 PM EDT
[#44]
Quote HistoryOriginally Posted By johnh57: It's 2/3 of the way there, but it's only moving about as fast as a .45-70 now. Still some 18 days to go to get out to its l2 orbit. Quote HistoryOriginally Posted By johnh57: Originally Posted By usptac: Originally Posted By ArGyLe64: When will it reach it's lagrange point? Or is it there already? I thought it was going to take some time to get out to L2. https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html It's 2/3 of the way there, but it's only moving about as fast as a .45-70 now. Still some 18 days to go to get out to its l2 orbit. The further it goes, the slower (relative to Earth) it gets. It should be pretty close to zero speed (relative to Earth) when it gets to L2. |
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Posted: 1/5/2022 4:32:05 PM EDT
[#45]
Quote HistoryOriginally Posted By redoubt: The further it goes, the slower (relative to Earth) it gets. It should be pretty close to zero speed (relative to Earth) when it gets to L2. Yes, true. But It will never actually be at L2. It's orbit around l2 is actually fairly large - roughly equivalent to the moons orbit around earth. |
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Posted: 1/5/2022 4:32:19 PM EDT
[#46]
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Posted: 1/5/2022 7:58:24 PM EDT
[#47]
Quote HistoryOriginally Posted By johnh57: I really dislike the where is Webb graphic. It's layed out like a map, but it's a timeline not a map. It's basically 1/2 way distance wise to l2, but it's mapped at less than 1/4 of the way there. Little late in replying here, but there are buttons to toggle the display between time and distance. They're located just under the "line" on the far right. . |
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Posted: 1/5/2022 8:13:16 PM EDT
[#48]
Quote HistoryOriginally Posted By wheel: Little late in replying here, but there are buttons to toggle the display between time and distance. They're located just under the "line" on the far right. . Yeah, those showed up a day or so after my post. All better now. |
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Posted: 1/6/2022 1:10:20 AM EDT
[Last Edit: midcap]
[#49]
hells yeah!
So tomorrow they are going to extend the aft instrument radiator? |
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Posted: 1/6/2022 1:51:26 AM EDT
[#50]
Quote HistoryOriginally Posted By DK-Prof: Lots of people have no idea what "clear" means until they have been in places with very little light pollution on a clear and moon-less night. I remember being in the Coral Sea, and on a remote island off the coast of Fiji - the sheer volume of stars you could see is amazing. Even Kauai and the Big Island are amazing (there's a reason all those observatories were built on Mauna Kea). My wife and I are planning the design of the house we are going to build on the Big Island, and we're talking about some kind of deck/platform on the top of the house, purely for star-gazing. I think I might pick up astrophotography as a hobby when I retire. Quote HistoryOriginally Posted By DK-Prof: Originally Posted By midcap: Originally Posted By Rudukai13: Originally Posted By midcap: Originally Posted By SecretSquirell: Originally Posted By slanted: Originally Posted By Rudukai13: People are trying to understand a non-localized non-propagating event (BB) by comparing it to a localized propagating event (our sun). The difference was actually explained fairly well in the most recent The Expanse novels: Stars, like our sun, emit energy locally in our universe and that energy propagates outward from that single point. Imagine dropping a pebble into a pool - it creates a ripple, and that ripple moves outward in all directions away from that localized point. This is a localized, propagating event. This is how light and gravity work in our universe. The creation of the universe (Big Bang) was a non-local, non-propagating event. Picture the pool that you previously dropped a pebble into, except now instead of a pebble you drop a sheet of glass the same size as the surface of the pool. Every point on the surface of the pool is affected all at the same time. This is what’s meant by a non-local, non-propagating event. You can’t see the sheet of glass striking the surface where you are right now because it happened in the past, but if you look far enough to the light that originated on the other side of the pool you should still be able to see the surface disruption just after the event occurred. That’s what they’re trying to do with JWST I get it, instead of watching a jar of tannerite explode, we are in the jar A jar 13 billion light years across. That lit off all at once. Really want to screw with your brain? The observable universe is ~93 billion light-years in diameter. then you really really want to mess with your brain...what is on the outside of that? Yeah Universe is fucking crazy man The other night it was clear...like really clear...I cupped my hands over my eyes and I was able to see the faint stars in the back ground. It was heavy manLots of people have no idea what "clear" means until they have been in places with very little light pollution on a clear and moon-less night. I remember being in the Coral Sea, and on a remote island off the coast of Fiji - the sheer volume of stars you could see is amazing. Even Kauai and the Big Island are amazing (there's a reason all those observatories were built on Mauna Kea). My wife and I are planning the design of the house we are going to build on the Big Island, and we're talking about some kind of deck/platform on the top of the house, purely for star-gazing. I think I might pick up astrophotography as a hobby when I retire. The stars under NODS at CWW at White Hills, with the Vegas lights off, made me want to find peyote .
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