User Panel
User Panel
User Panel
|
Posted: 4/28/2022 6:36:01 PM EDT
[#1]
Quote HistoryQuoted: The Speed of Light is NOT About Light: "The speed of light is often cited as the fastest anything can travel in our universe. While this might be true, the speed of light is the EFFECT and not the CAUSE of this phenomenon. So what's the cause? On this week's episode of Space Time, Matt helps explain what the speed of light REALLY is and why it’s the cosmic speed limit of our universe!"  https://www.youtube.com/watch?v=msVuCEs8YdoThe fastest thing known to man is a person's thought or thinking! |
|
|
|
Posted: 4/28/2022 6:36:28 PM EDT
[#2]
A light year is the distance light (in a vacuum) travels in a year.
The universe has a speed limit built in and light happens to travel at that speed so we call it the speed of light. But it's also the speed of gravity and the speed of all massless particles. There is a catch and that is that space is expanding so this throws a bit of a monkey wrench into everything when you are talking billions of light years. |
|
|
|
Posted: 4/28/2022 6:39:31 PM EDT
[#3]
Quote HistoryQuoted: I always understood light-year to be the distance that light travels in a year. Correct |
|
|
|
Posted: 4/28/2022 6:45:17 PM EDT
[#4]
Quoted: Having a discussion about the following quoted statement. Some people believe that it is wrong. Some people believe the speaker is contradicting himself. Some believe it's accurate. What say the hive? "When we hear the term light-year, we need to realize it is not a measure of time but a measure of distance, telling us how far away something is. Distant stars and galaxies might be millions of light years away, but that doesn’t mean it took millions of years for the light to get here, it just means it’s really far away." It sounds like the person making that statemenr is misunderstanding the expantion of the universe or they do and the quoting is inaccurate. The distant stars (moatly galaxies) were much closer when the light was emitted but while the light was traveling toward us they moved much further away due to the expansion of space itself. Mike |
|
|
|
Posted: 4/28/2022 6:46:17 PM EDT
[#5]
Quote HistoryQuoted: Simple...even though as we know it the earth may not have existed until 6000 years ago as you stated. But the space or rather where the earth formed did. So even though the earth may not have existed the light from distant star had reached the area/spot/position the earth occupies long before the the 6000 years you stated. Therefore we can see the light of those stars even though they may be millions of light years away. If we had telescopes powerful enough to see the actual stars or planets those vast distances. We'd be seeing images from thousand, millions of years ago. Based on how may light years those objects are from us. We'd be looking back in time. Simpler term...the sun light that reaches the earth and we see. We are looking back in time. Because it take 8 1/3 minutes for sunlight to reach the earth. Sun could expode and we'd not see it for 8 1/3 minutes afterwards. Then we'd die  Some of the stars we see at night no longer exist also. The died, burned out, went super nova ectttt.....thousand/millions of years ago. But we are still seeing their light. At least that's the way I understand it. |
|
|
|
Posted: 4/28/2022 7:02:41 PM EDT
[#6]
OK, My first response was rather silly about light in a doosh stuff but how is it that,
With modern space telescopes viewing thousand of light year away galaxies, we get a clear view of what took place many thousands of years ago. You would think, that galaxy light passing past black holes which pull in light before it gets here would distort the images, like trying to view a boob back in the day of scrambled tv porn channels. |
|
|
|
Posted: 4/28/2022 7:06:02 PM EDT
[#7]
Quote HistoryQuoted: I recall the day where I went around asking college graduates how many times in a decade the sun revolves around the earth.  Lots answered wrong.  that's because everything revolves around me... |
|
|
|
Posted: 4/28/2022 7:06:15 PM EDT
[#8]
Quote HistoryQuoted: Naw, the universe is only like 1 day older than the earth. Your probably right |
|
|
|
Posted: 4/28/2022 7:08:01 PM EDT
[#9]
Quote HistoryQuoted: Your probably right Quote HistoryQuoted: Quoted: Naw, the universe is only like 1 day older than the earth. Your probably right but it was a really, really, really, long day. |
|
|
|
Posted: 4/28/2022 8:57:12 PM EDT
[#10]
Quote HistoryQuoted: but it was a really, really, really, long day. Quote HistoryQuoted: Quoted: Quoted: Naw, the universe is only like 1 day older than the earth. Your probably right but it was a really, really, really, long day. Technically the measure of a day is based on Earth, so, without Earth, in a weird way there could be an argument that this could be true |
|
|
|
Posted: 4/28/2022 9:00:55 PM EDT
[#11]
Quote HistoryQuoted: Unless you and the object moved apart while the light was in transit. Quote HistoryQuoted: Quoted: If something is x light years distant then it took x years for the light to get here. This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. |
|
|
|
Posted: 4/28/2022 9:03:27 PM EDT
[#12]
Quote HistoryQuoted: 10 years, by definition. What answer did they give? https://pbs.twimg.com/media/C9LhJofV0AAv7dg?format=jpg&name=small 
|
|
|
|
Posted: 4/28/2022 9:09:31 PM EDT
[#13]
Quote HistoryQuoted: Technically the measure of a day is based on Earth, so, without Earth, in a weird way there could be an argument that this could be true No not really. A day is a measure of the Earth spinning on its axis. The Earth has slowed down in its rotation in the billions of years since formation. |
|
|
|
Posted: 4/28/2022 9:22:38 PM EDT
[#14]
Quote HistoryQuoted: This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. Quote HistoryQuoted: Quoted: Quoted: If something is x light years distant then it took x years for the light to get here. This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. I'm no expert in this kind of physics, but I believe our current understanding of the early universe involves matter flying apart at far greater than the speed of light. We have only scratched the surface of our knowledge of advanced physics. |
|
|
|
Posted: 4/28/2022 9:27:05 PM EDT
[#15]
Quote HistoryQuoted: This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. Quote HistoryQuoted: Quoted: Quoted: If something is x light years distant then it took x years for the light to get here. This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. Can you run that one by us again?  |
|
|
|
Posted: 4/28/2022 9:28:03 PM EDT
[#16]
Quote HistoryQuoted: The universe is expanding. That really fucks up measuring very long distances, or very long time spans. This. Is that what he was talking about? |
|
|
|
Posted: 4/28/2022 9:49:15 PM EDT
[#17]
is it on a treadmill
|
|
|
|
Posted: 4/28/2022 10:05:53 PM EDT
[#18]
Quote HistoryQuoted: No not really. A day is a measure of the Earth spinning on its axis. The Earth has slowed down in its rotation in the billions of years since formation. Yes, and if there's no Earth, how long would a day be? |
|
|
|
Posted: 4/28/2022 10:08:05 PM EDT
[#19]
Quote HistoryQuoted: I always understood light-year to be the distance that light travels in a year. Yep… |
|
|
|
Posted: 4/28/2022 10:11:50 PM EDT
[#20]
Quote HistoryQuoted: Can you run that one by us again? Quote HistoryQuoted: Quoted: Quoted: Quoted: If something is x light years distant then it took x years for the light to get here. This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. Can you run that one by us again? This was typed hastily. What I meant was if 1 MY ago we somehow saw light from an object that was directly/exactly converging with Earth and 1M LY away, that after 1MY it would have travelled no more than 1MY LY, putting it on top of us. |
|
|
|
Posted: 4/28/2022 10:12:31 PM EDT
[#21]
Quote HistoryQuoted: Is he the one who invented Fettucine? May be, but he's not Afraido nothin'! |
|
|
|
Posted: 4/28/2022 10:12:46 PM EDT
[#22]
Quote HistoryQuoted: Yep… Quote HistoryQuoted: Quoted: I always understood light-year to be the distance that light travels in a year. Yep… Generally speaking, but your equation for transwarp beaming would be off by enough to get you killed.  
|
|
|
|
Posted: 4/28/2022 10:14:31 PM EDT
[#23]
Quote HistoryQuoted: I'm no expert in this kind of physics, but I believe our current understanding of the early universe involves matter flying apart at far greater than the speed of light. We have only scratched the surface of our knowledge of advanced physics. Quote HistoryQuoted: Quoted: Quoted: Quoted: If something is x light years distant then it took x years for the light to get here. This is true. However, the speed of the expansion of the universe should have an upper limit at the speed of light, so even if you were 1M LY away when the light first started travelling, the furthest away it could possibly even theoretically be after 1M years is 1 more million LY years away (and conversely it would be impacting Earth if we were expanding toward each other). Which is not what I believe the OPs quote was trying to convey. I'm no expert in this kind of physics, but I believe our current understanding of the early universe involves matter flying apart at far greater than the speed of light. We have only scratched the surface of our knowledge of advanced physics. You're right, and I wasn't really specific on that. But to clarify, I was talking in context of the current universe as we know it today (or if you like, the current universe +/- 1 MY which in the grand scheme of things shouldnt be much different). |
|
|
|
Posted: 4/28/2022 10:17:05 PM EDT
[#24]
Quote HistoryQuoted: What is the speed of light when wrapped up in a doosh in the middle of the night? blinded 
|
|
|
|
Posted: 4/28/2022 10:37:31 PM EDT
[#25]
Quote HistoryQuoted: Not only is it expanding, it's accelerating, which means at some point, light will be create that never reaches us...ever. I chuckle when cosmologists claim to know the mass in the universe when we can't ever see the whole thing. |
|
|
|
Posted: 4/28/2022 10:40:07 PM EDT
[#26]
Two things, a.) light travels a bit slower on a leap year; and 3.) no matter what type of year, getting struck by lightning can kill you.
Amen. |
|
|
|
Posted: 4/28/2022 10:43:12 PM EDT
[#27]
Quote HistoryQuoted: If something is 1 million light years away, the light we are seeing now left that objects position 1 million years ago Not if it went through a dense part of space slowing it down. |
|
|
|
Posted: 4/28/2022 10:43:31 PM EDT
[#28]
Quote HistoryQuoted: OP is either a young earth creation idiot or has friends who are OP stop hanging around with young earth creation idiots They're the base of the Conservative movement/Republican party. I've wondered just what 40% of the adult population and 60% of churchgoers translates to in registered Republicans. I'm sure it's way more than most secular or mainline denominated folks think, especially in NY. |
|
|
|
Posted: 4/28/2022 10:59:22 PM EDT
[#29]
Quote HistoryQuoted: If something is 1 million light years away, the light we are seeing now left that object 1 million years ago Quote HistoryQuoted: Quoted: Having a discussion about the following quoted statement. Some people believe that it is wrong. Some people believe the speaker is contradicting himself. Some believe it's accurate. What say the hive? "When we hear the term light-year, we need to realize it is not a measure of time but a measure of distance, telling us how far away something is. Distant stars and galaxies might be millions of light years away, but that doesn’t mean it took millions of years for the light to get here, it just means it’s really far away." If something is 1 million light years away, the light we are seeing now left that object 1 million years ago You'd think, but that isn't entirely accurate. Space itself expands between objects, so it likely took a little longer. |
|
|
|
Posted: 4/28/2022 11:00:13 PM EDT
[#30]
Quote HistoryQuoted: It's really sad that they want to poison the minds of children with that ridiculous crap. Quote HistoryQuoted: Quoted: This, or more so their religious beliefs. Here is the source of the quote by the way: https://answersingenesis.org/kids/astronomy/why-are-stars-millions-of-light-years-away/ A light-year is a unit of distance, it is the distance that light travels in a vacuum in the span of a year. It's really sad that they want to poison the minds of children with that ridiculous crap. Yep, I really wish people would stop pushing religion on little kids. It is basically brainwashing. 
|
|
|
|
Posted: 4/28/2022 11:06:05 PM EDT
[#31]
Quote HistoryQuoted: Yep, I really wish people would stop pushing religion on little kids. It is basically brainwashing. Quote HistoryQuoted: Quoted: Quoted: This, or more so their religious beliefs. Here is the source of the quote by the way: https://answersingenesis.org/kids/astronomy/why-are-stars-millions-of-light-years-away/ A light-year is a unit of distance, it is the distance that light travels in a vacuum in the span of a year. It's really sad that they want to poison the minds of children with that ridiculous crap. Yep, I really wish people would stop pushing religion on little kids. It is basically brainwashing. I don't have a problem with parents and religious people teaching religion to children. I do have a problem with crackpot pseudoscience disguised as religion being taught to children. It can only serve to confuse them when they try to learn actual STEM. YEC has no resemblance to the Christian education I received as a child. |
|
|
|
Posted: 4/28/2022 11:13:23 PM EDT
[#32]
Quote HistoryQuoted: Yes, and if there's no Earth, how long would a day be? It depends on where you're measuring it from I suppose. We know the length of days on our nearest neighbors pretty well. Mercury1,408 hours Venus5,832 hours Mars25 hours Jupiter10 hours Saturn11 hours Uranus17 hours Neptune16 hours But we're also using a measurement based on Earth's day so if there was no Earth hours are meaningless. As is the concept of a day. Time could be expressed in other standards that exist in an Earthless universe though |
|
|
|
Posted: 4/28/2022 11:18:02 PM EDT
[#33]
Birds aren't real.
|
|
|
|
Posted: 4/28/2022 11:20:57 PM EDT
[#34]
Quote HistoryQuoted: It's a velocity measurement and also a unit of distance(because the speed of light in a vacuum is constant) Like Miles/hr. Except this is 186,xxx miles per SECOND X 31557600 seconds (per year) X how many years away the object was when the light left it and headed our way. So, no. The author is wrong. It literally took millions of years for the light to arrive. |
|
|
|
Posted: 4/28/2022 11:26:27 PM EDT
[#35]
Quote HistoryQuoted: It depends on where you're measuring it from I suppose. We know the length of days on our nearest neighbors pretty well. Mercury1,408 hours Venus5,832 hours Mars25 hours Jupiter10 hours Saturn11 hours Uranus17 hours Neptune16 hours But we're also using a measurement based on Earth's day so if there was no Earth hours are meaningless. As is the concept of a day. Time could be expressed in other standards that exist in an Earthless universe though Such as a light year?
|
|
|
|
Posted: 4/28/2022 11:31:37 PM EDT
[#36]
Quote HistoryQuoted: We have only scratched the surface of our knowledge of advanced physics. And yet, scientists have no room for creationism or even God in their view. If they know anything, they should at least know how little they know about the universe. Hard to take them seriously sometimes. I'm not saying the universe is 6,000 years old, but I'm simply pointing out that science has two theories that are taught as fact for all intent and purposes, and they are mutually exclusive. They cannot both be true. Those are the big bang theory and the theory of biogenesis. I'm not claiming to have the answer. But I sure as shit am convinced they don't have the answer either. |
|
|
|
Posted: 4/28/2022 11:32:16 PM EDT
[#37]
Quote HistoryQuoted: OK, My first response was rather silly about light in a doosh stuff but how is it that, With modern space telescopes viewing thousand of light year away galaxies, we get a clear view of what took place many thousands of years ago. You would think, that galaxy light passing past black holes which pull in light before it gets here would distort the images, like trying to view a boob back in the day of scrambled tv porn channels. |
|
|
|
Posted: 4/28/2022 11:41:50 PM EDT
[#38]
Quote HistoryQuoted: And yet, scientists have no room for creationism or even God in their view. If they know anything, they should at least know how little they know about the universe. Hard to take them seriously sometimes. I'm not saying the universe is 6,000 years old, but I'm simply pointing out that science has two theories that are taught as fact for all intent and purposes, and they are mutually exclusive. They cannot both be true. Those are the big bang theory and the theory of biogenesis. I'm not claiming to have the answer. But I sure as shit am convinced they don't have the answer either. Quote HistoryQuoted: Quoted: We have only scratched the surface of our knowledge of advanced physics. And yet, scientists have no room for creationism or even God in their view. If they know anything, they should at least know how little they know about the universe. Hard to take them seriously sometimes. I'm not saying the universe is 6,000 years old, but I'm simply pointing out that science has two theories that are taught as fact for all intent and purposes, and they are mutually exclusive. They cannot both be true. Those are the big bang theory and the theory of biogenesis. I'm not claiming to have the answer. But I sure as shit am convinced they don't have the answer either. There are questions in this universe that we don't even know how to ask yet. |
|
|
|
Posted: 4/28/2022 11:43:02 PM EDT
[#39]
It's sad to think all stars will eventually be red shifted out of the visible light spectrum from any point in space due to the expansion of the universe. Infinity will be darkness. Wow, I need a beer.
|
|
|
|
Posted: 4/28/2022 11:44:11 PM EDT
[#40]
Quote HistoryQuoted: It depends on where you're measuring it from I suppose. We know the length of days on our nearest neighbors pretty well. Mercury1,408 hours Venus5,832 hours Mars25 hours Jupiter10 hours Saturn11 hours Uranus17 hours Neptune16 hours But we're also using a measurement based on Earth's day so if there was no Earth hours are meaningless. As is the concept of a day. Time could be expressed in other standards that exist in an Earthless universe though Exactly |
|
|
|
Posted: 4/28/2022 11:45:39 PM EDT
[#41]
Shit was a lot closer together n billions of years ago.
|
|
|
|
Posted: 4/28/2022 11:46:59 PM EDT
[#42]
Quote HistoryQuoted: There are questions in this universe that we don't even know how to ask yet.  Attached File |
|
|
|
Posted: 4/28/2022 11:49:15 PM EDT
[#43]
Quote HistoryQuoted: It's sad to think all stars will eventually be red shifted out of the visible light spectrum from any point in space due to the expansion of the universe. Infinity will be darkness. Wow, I need a beer. |
|
|
|
Posted: 4/28/2022 11:51:18 PM EDT
[#44]
Quote HistoryQuoted: If something is 1 million light years away, the light we are seeing now left that object 1 million years ago This is good. Imagine a radar than spins around once a minute, or 5 minutes. You get a ping on an object with a theoretical known course but a silly crazy velocity like Mach 7. Multiply this times n^87 and you got the op. This has been stated in various ways on the first page already. |
|
|
|
Posted: 4/28/2022 11:53:29 PM EDT
[#45]
Quote HistoryQuoted: That may happen with galaxies, but stars inside our galaxy will remain visible for billions of years. Much longer than our planet will survive. Quote HistoryQuoted: Quoted: It's sad to think all stars will eventually be red shifted out of the visible light spectrum from any point in space due to the expansion of the universe. Infinity will be darkness. Wow, I need a beer. Yes, but I was thinking of the end of those billion years. To infinity and beyond will be a dark cold place. |
|
|
|
Posted: 4/28/2022 11:55:07 PM EDT
[#46]
Quote HistoryQuoted: Yes, but I was thinking of the end of those billion years. To infinity and beyond will be a dark cold place. Quote HistoryQuoted: Quoted: Quoted: It's sad to think all stars will eventually be red shifted out of the visible light spectrum from any point in space due to the expansion of the universe. Infinity will be darkness. Wow, I need a beer. Yes, but I was thinking of the end of those billion years. To infinity and beyond will be a dark cold place. Hey. If a North Dakotan wants to think about the Heat Death of the Universe all he has to do is look out the window. Chin up, man. There's shit to be done! |
|
|
|
Posted: 4/28/2022 11:58:57 PM EDT
[#47]
The truth is it doesn't matter. Concepts like light and time have no meaning other than perpetuating the power structures of white supremecy and cis-normative bigotry
|
|
|
|
Posted: 4/29/2022 12:02:49 AM EDT
[#48]
Quote HistoryQuoted: Hey. If a North Dakotan wants to think about the Heat Death of the Universe all he has to do is look out the window. Chin up, man. There's shit to be done! Quote HistoryQuoted: Quoted: Quoted: Quoted: It's sad to think all stars will eventually be red shifted out of the visible light spectrum from any point in space due to the expansion of the universe. Infinity will be darkness. Wow, I need a beer. Yes, but I was thinking of the end of those billion years. To infinity and beyond will be a dark cold place. Hey. If a North Dakotan wants to think about the Heat Death of the Universe all he has to do is look out the window. Chin up, man. There's shit to be done! We will be the last men standing!! |
|
|
|
Posted: 4/29/2022 12:03:42 AM EDT
[#49]
Quoted: Having a discussion about the following quoted statement. Some people believe that it is wrong. Some people believe the speaker is contradicting himself. Some believe it's accurate. What say the hive? "When we hear the term light-year, we need to realize it is not a measure of time but a measure of distance, telling us how far away something is. Distant stars and galaxies might be millions of light years away, but that doesn’t mean it took millions of years for the light to get here, it just means it’s really far away." Due to the expanding nature of the universe, it is somewhat true, but light from something 100 million light years away started something like 99 million years ago not a few thousand years ago. |
|
|
|
Posted: 4/29/2022 12:13:09 AM EDT
[#50]
Keep it simple
If you are looking at the light from a star that is 300 light years away then the light you see left the star 300 years ago. |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
