Time-travel may have been the subject of study – as well as a subject of scores of novels and shows. While we are not talking about the time-travel machine here, what we are talking about is looking into the past.
Light requires 8 minutes from the sun to reach the Earth. Since the time needed is 8 minutes from the star which is the nearest to us, then how much time would it take for light from more distant stars to reach our eyes? Food for thought!
As per the research in science, it absolutely true that when you are looking at a star, you are actually looking at how it was and not how as it is. At the moment the farthest star is the Constellation Cassiopeia which can be seen with the naked eye, the amount of light it produces takes no less than 4000 years to reach us! So, when you actually see that star, it might not even exist now! We are looking into the past! Sometimes it can also be like what you are looking at is one light year away and what you see is what there was one year ago.
However, the usage of a high powered telescope allows the time gap to grow exponentially.
Today the most farthest object spotted is a galaxy approximately 13.4 billion light years away, which means that our image of it is older than the earth itself. We are still figuring out on what is there and what is not in the huge universe, as it is not sure if the stars we see at night still there.
Many of the stars could have gone supernova hundreds of years ago and we still would not know it. Life span of stars is as long as trillions of years. Many of the stars which take birth in a distant universe and we cannot even see that.
The universe in indeed, full of mystery isn’t it?