If u travelled in light years and got lost in time in space.How old would u be?
360465
A light year is measured by the time on Earth not by your watch.  However, since one light year is the measurement of the distance that light travels in one Earth year, then one light year always equates to one year on Earth.  So, if you travel one light year, you should be one year older and the Earth would also be one year older (assuming no time anomalies, like a black hole, are encountered during the trip).  Keep in mind that a 'light year' actually measures distance (based on the speed of light).  \n\nHowever, time is always relative to where you are.  So, for you, time progresses at the same rate it always has (for the human body) no matter what's going on around you.  So, if you were gone for 3 minutes (clock time), you'd be three minutes older.  If you were gone for 24 hours, then you'd be 24 hours older.\n\nHowever, if you were to visit the proximity of a black hole, the theory is that time slows down.  So, while your watch may continue at the same rate as it always has (your time has actually slowed down).  So, time on Earth would be progressing at a much faster rate relative to you (even though Earth's progression is normal to them).  So, if you returned to Earth and your watch was only 12 hours later than when you left, time may have progressed days or weeks on Earth.  In which case, your body would have aged 12 hours instead of the days or weeks that it would have progressed if on Earth.
1121759
well...we know that the universe is 156 billion light years...that means that it takes 156 billion years for light to get across. (ei) if a star at the very end of the universe exploded, 156 billion years from now, we would see it
552499
Depends on how old you are.
862196
From our perception here on earth, it would appear to end at where space and time begins.  Remember that because the speed of light is finite, you can look at a galaxy that's 10 billion light-years away and you'll actually see it AS IT WAS 10 billion years ago....so theoretically, you can look back to the beginning of time itself.  You can't see that far away and perceive anything as it is NOW.  So the CURRENT limits are quite unknown...if there are indeed any.
238110
You would need a time portal machine
317753
Space is very vast and the distances are in the order of millions of light years to the farthest reaches of the universe. Even if we learn to travel at the speed of light, it will be impossible to travel for millions of years for one person or one generation. Some have proposed that there may be holes in the fabric of space-time which would enable us to reach such places without going throught the distance in between. This remains to be proven.
990179
time is not the movement of light. \nit is only perceived that way because it's the fastest thing we know of.  \n\nIf you traveled to a planet that is 4 lightyears away in only 3 years, time has still passed, and you are still older, you have simply managed to get to that planet faster than light waves were able to.
1103303
I would travel thru time
193083
It would take 4.3 years to get to the nearest star (Proxima Centauri) if you were traveling at the speed of light. However, it would take nearly 118,000 years to get there if you were traveling at the speed of a space shuttle (approximately 25,000 mph).
787354
Yes, we're seeing what happened to/on that planet 50,000 years ago. Light years are a measure of distance, not time; one light year is the distance that light travels in one year. Therefore, the light we're seeing from that certain planet left that planet 50,000 years ago. It's like looking back in time.
721881
I dont think time travel is possible! Even if you were to go faster than the speed of light, it still takes time to get to where you are going. And that brings up another question, where do you go?? Do you zoom around the planet a few million times? Which direction? Does it matter, it still takes TIME to do it.\n\nJust for argument sake, lets say you could go back (or forward) in time. I dont know why you couldnt be seen, you just traveled to a different time and when you get there your there, just as if you were to travel to a different city.
773776
Eternal life, BUT ONLY IF I my age could be permanently set at say, 34 years of age. Not too young, not too old, and spared an eternity of being fragile and wrinkled.  I'd probably have to wander a lot, being that a guy who stays perpetually 30-something would generate suspicion in a neighborhood eventually, but the opportunities to learn countless languages, musical instruments, see civilizations rise and fall, and -- ahem -- have a multitude of lovers seems really fascinating and exciting.\n\nThe other caveat would be if I could take my own life if necessary.  I'd hate to be the last person on earth should nuclear devastation render it a barren heap of ruins, cockroaches, and kudzu.  I suppose jumping into a live volcano might do the trick.\n\nAnd if all that couldn't be arranged, yeah...show me the $$$$$!  First round of lattes are on me!
297501
I'm sure you are spekaing strictly hypothetically, but don't forget the closer you get to the speed of light (c), the slower time moves around you.  So if you were to go like 90% of c for 1 year, more than 1 year would pass for everyone else.
1161757
nop im not a human im an alien from out of space i came from a planet 12324353 light years away from earth and i got no problems wots so eva :p
376769
light years isn't a time, it is a distance \nso it would be 2 light years
1054714
if we travel at the speed of light, it would take approximately 4.2 years to travel to Proxima Centauri.  Obviuosly, we can't reach that speed.  Space Shuttles can reach a speed of 17,500 mph or 7823.2 m/s.  With this speed, it would take 161059.4 yrs
59515
Time travel is actually 100% possible.  You're time travelling right now, the problem is that you cannot control how to time travel.  \n\nIf you had enough fuel on a spaceship that could go at 99% the speed of light, the time on the spaceship is slowed down dramatically, this is called time dilation, which means your biological clock also slows down, slowing your aging process.  If you come back to Earth by travelling 60000 light-years, you're only 40 years older then, but the Earth and everyone on it is 60000 years older.\n\nTime travelling to the past is currently not possible.