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When we look at the stars are we seeing what they looked like years ago? And how many years ago is i

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Submitted : 2018-06-14 03:37:29    Popularity:     

Tags: stars  looked  years  

How far away from us are they? A light Year is about 6,000,000,000,000 years. If a stay was that far away, the light would take ONE YEAR to get uere

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How far away from us are they?

A light Year is about 6,000,000,000,000 years. If a stay was that far away, the light would take ONE YEAR to get uere

Yes. Between about four years ago and several thousand. The most distant visible star in normal circumstances is Alpha Camelopardalis, which is six thousand light years away. Supernovae can be visible for short periods at a much greater distance though.

We are... and, most the stars we can see with our eyes are all within a few dozen to a few thousand light years. The belt of Orion, for example has 3 stars that vary from about 600 to about 1600 light years away - which means we’re seeing them in the past from 600 to 1600 years ago. The nearest - Alpha Centauri - is about 4.3 light years away, so - we’re seeing it as it was during the Obama administration.
People with excellent eyes can make out the Andromeda Galaxy - not just an individual star, but billions of them - about 2.3 million light years out - so, we’re seeing it as it was 2.3 million years ago.

Distances to stars, in astronomy, is based on how long it took the light to get here.
Since what we see is the light, then we see the star as it was, when the light left there.

Compared to distances in the universe, light is "slow". For example, the light from the pole star (Polaris, in the constellation of the small bear) takes roughly 400 years to get here. Therefore, when we look at that star "now", we see it as it was 400 years ago.
And we say its distance is "400 light-years".

Using that system, our Sun is (on average) 499 "light-seconds" away; we see it as it was 8m19s ago. In January it is a bit closer, and in July it is a bit further away.

If you observe the sky from a very dark site, you can see a blotch that we call the Andromeda galaxy. It is two-and-a-half million light-years away. We see it (and all the stars it contains) as it was 2.5 million years ago. People doing celestial mechanics (calculating the movement of objects) will use the galaxy's proper motion (and our own Galaxy's motion) into account to calculate the present position.
However, in astronomy we don't bother. If you see a star that suddenly flared up last night, you simply say "it flared up last night". You don't bother trying to work the time backwards to (let's say) whatever date it was, 400 years ago, when the star really flared up.

The answer is different depending on how far away the star is. For Alpha Centauri, it's about 4 years. For Betelgeuse, over 600 years. For the sun, about 8 minutes.

So yeah, Betelgeuse could have suddenly disappeared around the time of the American Revolution but we wouldn't know it for another couple of centuries.

Depends on the distance. The Closest is Four Years, others are Hundreds of years.

Yes, when we look at stars we ARE seeing them as they were years ago. more than 4 years for the closet TRIPLE star system. to 8 years of Sirius to hundreds or thousands of years for stars in the Milky Way Galaxy to 2 and to 3 and million years for Andromeda Galaxy 1 ( M31 ) . to millions of years for other galaxies. If and when Betelgeuse goes supernova we will NOT know it went supernova for more than 600 years..

MOST of the stars we at night have NOT burned out.. People exaggerate a LOT.. I've been watching stars for ORE than 60 years Stars disappear because of light pollution and high humidity, not always at ground level, not because they have burned out.

It depends on how far away the star is. The closest stars are about 5 years away, the farthest we can see are thousands of years away. There are galaxies where we can't see individual stars, only a kind of general glow, that are BILLIONS of years away.

For some it's a million years ago. Some of the stars we see burned out hundreds of thousands of years ago.

Yes, we are seeing their past, but how far back depends on how far away the star is .....................



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