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Posted: 2/10/2016 2:26:08 PM EDT
[#1]
Quote HistoryQuoted:
How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. |
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Posted: 2/10/2016 2:48:49 PM EDT
[#2]
Quote HistoryQuoted:
You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Quote HistoryQuoted:
Quoted:
How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. |
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Posted: 2/10/2016 3:14:48 PM EDT
[#3]
Quote HistoryQuoted:
Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. Quote HistoryQuoted:
Quoted:
Quoted:
How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. That would be pretty cool. |
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Posted: 2/10/2016 3:42:17 PM EDT
[#4]
Quote HistoryQuoted:
Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. Quote HistoryQuoted:
Quoted:
Quoted:
How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. Not to nitpick, just more of an FYI. There are 18 segments. |
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Posted: 2/10/2016 3:56:49 PM EDT
[#5]
Quote HistoryQuoted:
Not to nitpick, just more of an FYI. There are 18 segments. Quote HistoryQuoted:
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How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. Not to nitpick, just more of an FYI. There are 18 segments. Thanks for the correction... Memory isn't what it used to be. 
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Posted: 2/10/2016 7:09:35 PM EDT
[#6]
Quote HistoryQuoted: Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. Quote HistoryQuoted: Quoted: Quoted: How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc.  Because of this six of the mirror segments fold off to the side and are rotated into place after launch:  If something happens where three or six of the mirrors can't rotate into place the telescope will still be functional with a decreased light gathering power. |
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Posted: 2/10/2016 7:22:49 PM EDT
[#7]
Quote HistoryQuoted:
Another level of redundancy comes in with the mirror deployment. The mirror at full width won't fit in the launch vehicle: http://www.americaspace.com/wp-content/uploads/2014/02/dfd.jpg Because of this six of the mirror segments fold off to the side and are rotated into place after launch: http://i.kinja-img.com/gawker-media/image/upload/uiznslrmwqxkl5qbyy0j.gif If something happens where three or six of the mirrors can't rotate into place the telescope will still be functional with a decreased light gathering power. Quote HistoryQuoted:
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How does that design help if the lens is ground wrong? You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either. Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc. http://www.americaspace.com/wp-content/uploads/2014/02/dfd.jpg Because of this six of the mirror segments fold off to the side and are rotated into place after launch: http://i.kinja-img.com/gawker-media/image/upload/uiznslrmwqxkl5qbyy0j.gif If something happens where three or six of the mirrors can't rotate into place the telescope will still be functional with a decreased light gathering power. That's cool. I can't wait until the Webb is in position and operational; if you think Hubble images are spectacular... |
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Posted: 2/10/2016 7:35:52 PM EDT
[#8]
Quote HistoryQuoted: That's cool. I can't wait until the Webb is in position and operational; if you think Hubble images are spectacular... Big pic of andromeda in the infrared.  Here are some more images from the Spitzer telescope which is basically a lower power version of the Webb:  |
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Posted: 2/11/2016 3:01:23 PM EDT
[#9]
Quote HistoryQuoted: It'll be cool but expect the pics to be a little different. Hubble's focus was more on the visible spectrum where as James Webb's focus is infrared: Big pic of andromeda in the infrared. Here are some more images from the Spitzer telescope which is basically a lower power version of the Webb: https://upload.wikimedia.org/wikipedia/commons/3/38/PIA19872-12thAnniversarySpaceCalendar-SpitzerST-20150820.jpg Quote HistoryQuoted: Quoted: That's cool. I can't wait until the Webb is in position and operational; if you think Hubble images are spectacular... Big pic of andromeda in the infrared. Here are some more images from the Spitzer telescope which is basically a lower power version of the Webb: https://upload.wikimedia.org/wikipedia/commons/3/38/PIA19872-12thAnniversarySpaceCalendar-SpitzerST-20150820.jpg So we are going to see hell? Good thread, btw... thanks! |
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Posted: 2/15/2016 2:39:31 PM EDT
[#10]
Rosette Nebula with Narrowband filters:
http://c2.staticflickr.com/2/1698/24866399611_a75c48b2ad_k.jpg 
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Posted: 2/15/2016 2:50:51 PM EDT
[#11]
Jupiter's magnetosphere is so large that if it were visible it would appear larger than the Moon in the night sky.
http://www.nasa.gov/centers/goddard/multimedia/largest/lighthouse.html 
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Posted: 2/15/2016 3:49:57 PM EDT
[#12]
Quote HistoryQuoted:
If Jupiter's magnetosphere is so large that if it were visible it would appear larger than the Moon in the night sky. http://www.nasa.gov/centers/goddard/multimedia/largest/lighthouse.html http://www.astrozero.co.uk/astronomy/jupiter_mag.jpg Wow! I love these perspective images. |
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Posted: 2/16/2016 2:25:58 PM EDT
[#13]
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Posted: 2/16/2016 2:32:56 PM EDT
[#14]
Did anyone else do a double take at "Libertad" and see "Libtard"?
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Posted: 2/16/2016 2:56:03 PM EDT
[#15]
Quote HistoryI needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. |
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Posted: 2/16/2016 3:02:26 PM EDT
[#16]
Quote HistoryQuoted:
I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. Quote HistoryQuoted:
I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. My wife thought the audio book was a better "movie" than the actual movie. I listened to it for a few minutes and thought it was just like a radio drama; highly recommended. |
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Posted: 2/16/2016 4:26:39 PM EDT
[#17]
Quote HistoryQuoted:
I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. Quote HistoryQuoted:
I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. Good info. I was planning to watch the movie with my wife this weekend and put the book on my reading list. |
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Posted: 2/16/2016 7:06:27 PM EDT
[#18]
Quote HistoryQuoted: My wife thought the audio book was a better "movie" than the actual movie. I listened to it for a few minutes and thought it was just like a radio drama; highly recommended. Quote HistoryQuoted: Quoted: I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. My wife thought the audio book was a better "movie" than the actual movie. I listened to it for a few minutes and thought it was just like a radio drama; highly recommended. |
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Posted: 2/16/2016 7:11:09 PM EDT
[#19]
Quote HistoryQuoted: I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. Quote HistoryQuoted: I needed that when reading "The Martian" book. It's far more awesome than the movie! That map seems to be centered for the book/movie areas on Mars. Fun fact: we now have higher res photos of Mars then what we had when the book was written. Because of that what looked like a good path then now looks like a poor choice. Things like fields of meter sized boulders didn't show up on the lower res maps. |
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Posted: 2/17/2016 6:20:01 PM EDT
[#20]
One of the stages on a Saturn V separating: http://i.imgur.com/COKHuNH.gifv
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Posted: 2/17/2016 7:04:45 PM EDT
[#21]
Quote HistoryI grew up in the 60's with the space race and had a model of the Saturn V that was about 4 feet tall - that was one hell of a machine! |
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Posted: 2/18/2016 11:17:51 AM EDT
[#22]
Quote HistoryQuoted:
I grew up in the 60's with the space race and had a model of the Saturn V that was about 4 feet tall - that was one hell of a machine! Quote HistoryQuoted:
I grew up in the 60's with the space race and had a model of the Saturn V that was about 4 feet tall - that was one hell of a machine! Drive past one every day on my way to work, and every day I look at it and admire the achievement. |
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