"travel ahead of time"

@shyamlal (3535)
India
November 19, 2009 9:10am CST
Well this is a concept that always amazes me and on the same same time confuses me a lot.. I once heard some one say- "You can travel ahead of time- if you can travel at the speed of light" .. Well I could't make that out..I talked with someone else and he said.."Look at the stars"..According to him we are seeing the past..as he said something like "that star existed there million years ago and we are seeing it"... But how can it be true..We are just seeing the light that took such time to reach here.. Can anyone explain this to me ?
3 responses
@nimaro (94)
• United States
19 Nov 09
Your friend has a romantic view of light. When light leaves from, say our sun for example, it takes seven minutes to get here. It's not 'time-traveling' it's just seven minutes old light by the time you see it. With stars it is true that they can have been destroyed by the time their light reaches us (because they're years away, not minutes like our sun). However it's like this: If someone throws a baseball at you then spontaneously combusts, the baseball is still moving in air towards you, regardless of how the person who threw it exploded and no longer exists.
@shyamlal (3535)
• India
19 Nov 09
Yeah that's what me too said..but what is the basis of all those time traveling talks..I am just being curious..!!!
@nimaro (94)
• United States
19 Nov 09
There isn't any basis! It's just people fantasizing about time-travel and stretching the truth to make theories fit.
• United States
20 Nov 09
I read that it takes sunlight eight minutes to reach us, and it's kind of funny to think about because when you go out you instantly feel the warmth from the sun. But yeah, if a star blows up, we won't be able to "see" it until millions of years later, because that's when the light from the star's explosion will come close enough to our planet for scientists to see in space using telescopes or orbits or whatever. If you think about it, everything in space is so far away, and what we're seeing might be the past because it takes so many years for something so far away to be able to become visible to us. But as for stars, I'm not sure. I think when you see a star in the sky, you're actually really seeing it since it's still, whereas with a star that exploded, it'll take time for the light of that star to come closer to us.
@shyamlal (3535)
• India
21 Nov 09
We are not actually seeing stars here...We are just seeing some light emitted from some star.
@bird123 (10475)
• United States
20 Nov 09
Time travel 101 : The rate of time changes with aceleration or gravity. It slows. If you are going near the speed of light, your rate of time is slow compared to the rest of the world. When you come back to the rest of the world time, more time has passed than your time. You are in the future. Light: What we really see is not objects. We see light. The colors of objects seen are the colors of the spectrum not absorbed by the object. Neat, huh? Light coming from galaxies millions of light years away is millions of years old. We are seeing millions of years in the past.
@shyamlal (3535)
• India
21 Nov 09
About the light thing..What we see of the light coming from a star..Its the present form of that light..I mean it started its journey a long time ago..It also got changed or grew old or I say faded with time and reached here. So we are actually seeing the present..Am I correct ?