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EvC Forum ⇒ Science Forums ⇒ Big Bang and Cosmology ⇒

How is the Universe here?

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Author Topic:   How is the Universe here?
Huntard
Member (Idle past 2323 days)
Posts: 2870
From: Limburg, The Netherlands
Joined: 09-02-2008

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Message 18 of 131 (487087)
10-27-2008 3:30 PM 		Reply to: Message 17 by onifre
10-27-2008 1:30 PM

onifre writes:
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For distances in the billions of light years, the future could be 100's of years away. So a Supernova explosion, billions light years away, would be seen by Aliens near it long before us here on Earth see it. Making their present experience, of seeing the Supernova explode, an experience that we'll see 100's of years later.
Wouldn't a supernova happening billions of light years away actually take billions of years to be seen here on earth? Since the light that that explosion produces would take billions of years to get here? Or am I missing something?
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I hunt for the truth
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Huntard
Member (Idle past 2323 days)
Posts: 2870
From: Limburg, The Netherlands
Joined: 09-02-2008

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Message 24 of 131 (487098)
10-27-2008 5:03 PM 		Reply to: Message 22 by onifre
10-27-2008 5:00 PM

But if a light year is the distance travelled by light in one year, then a supernova 1 billion light years away would mean that the light emitted from that explosion takes 1 billion years to get here, right?
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{ABE} I feel so smart now, thanks Cavediver!
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Edited by Huntard, : edited in little text patting myself on the back
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I hunt for the truth
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Huntard
Member (Idle past 2323 days)
Posts: 2870
From: Limburg, The Netherlands
Joined: 09-02-2008

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Message 27 of 131 (487102)
10-27-2008 5:16 PM 		Reply to: Message 26 by onifre
10-27-2008 5:11 PM

Yes, I know it's a measure of distance. The distance light travels in one year. As to what the distance to Andromeda has to with this I'm not sure. But if there would be a supernova in Andromeda, it would take us 2.3 million years to notice, since that's the first time the light gets here.
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I hunt for the truth
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