When were looking at stars, is it in real time or like looking at the past or like looking at re-runs? Since were talking about light years away, does this mean that were looking at the lights of the stars that happened light years ago?
2006-12-29 00:22:03 · 7 answers · asked by duh?? 2 in Science & Mathematics ➔ Astronomy & Space
Yes everything u say is true.
Consider a star 10000 light years away.
A light year is the distance travelled by light during the duration of 1 year of earth i.e.365 days.
If you are observing the star which is possible due to the light emitted by it 10000 years before,which has reached you now after travelling for 10000 years.
So you are literally seeing the past!!
2006-12-29 00:23:26 · answer #1 · answered by Som™ 6 · 0⤊ 0⤋
Yes, it's true. But when you're looking at a sky, you're actually looking at multiple times. Each star shows an event at a different time because they are each at different places in the universe. The most recent time you can see in the sky is the moon, which is about 1-2 light seconds. The nearest star you can see is Proxima Centauri, which is looking 4 years into the past. The furthest you can see is roughly looking into the past 13 billion years! Of course, that's only possible with extremely powerful telescopes.
2006-12-29 02:32:26 · answer #2 · answered by gooeyjim 2 · 0⤊ 0⤋
Stars have been forming for (sort of) the previous 12 billion* years. Stars have been "dying" for... the previous 12 billion years. a typical famous individual's "existence" is counted in billions of years. the main huge stars would desire to stay for a "very short" time of a few tens of millions years. those may be the extremely super stars.** The smallest attainable stars (lots smaller than our sunlight) would desire to stay for trillions of years. The Observable Universe seems to be "basically" 13.7 billion years previous. a hundred 3 hundred and sixty 5 days isn't even a blink of an eye fixed on that scale. Our own sunlight became "born" sort of 5 billion years in the past, and it might bypass on fusing hydrogen for yet another 5 billion years. Then it might bypass right into a purple massive degree, expel it outer layers and alter right into a dwarf famous individual, shining (from amassed warmth) for yet another 10 billion years after that. --- * i'm utilising the "short-scale" billion = a million,000 million. ** extra huge stars have extra "gasoline" yet use it up lots swifter as a fashion to stay to tell the story the mammoth pressures: the radiative stress (outward, from easy) would desire to stability the inward gravity stress. as a results of fact of this huge stars have shorter lives.
2016-10-19 03:18:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋
If you look at your spouse ten feet away,you are looking at them as they existed billionths of a second ago.
It is just a matter of time and distance,everything is in the past to you,
2006-12-29 01:30:07 · answer #4 · answered by Billy Butthead 7 · 0⤊ 0⤋
In effect yes. When you look at a nova, you are looking at en event which did happen in the past, but we are only seeing it now.
2006-12-29 00:24:14 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Yes, but without feeling any changes of the past..
2006-12-29 00:35:24 · answer #6 · answered by Drone 7 · 0⤊ 0⤋
yes cause the light takes so long to travel to the earth
2006-12-29 00:32:34 · answer #7 · answered by Landon L 1 · 0⤊ 0⤋