General Question

RandomMrdan's avatar

Can you help with this conversion?

Asked by RandomMrdan (7423points) November 16th, 2010 from iPhone

It’s a matter of travel an speed and the time passed.

Hypothetically, if I left earth at the speed of light, and travelled for one year, and by the end of my year of travel I ended back at earth. How much time will have passed here on earth?

I recall something about time nearly stopping for anyone traveling at that speed, but only for the person going that fast. So the question is, how many earth years will pass compared to a single year of light speed travel?

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9 Answers

Zyx's avatar

Here you go, the answer to your question is in there.
And AT light speed you would be ballistic: unable to stop without hitting something. As time would be frozen for you. Nothing can move faster than the speed of light so when you reach that speed you are unable to make any other movements, that simple. So you also wouldn’t be able to get back to earth. Things moving at the speed of light are the strings that hold time and space together and bitches of nature every single one.

anothermember's avatar

I thought time only felt like it was stopping if you were traveling directly away from earth because you would be traveling at the same speed as the image of the earth at the moment you just left. If you had a telescope with infinite range and a ship that traveled faster then light you should be able to see into the past. Of course I don’t think we – Humankind- know the answer to this one.

@Zyx wouldn’t it only “seem” as though nothing could travel at the speed of light as we could not see it. If it was traveling towards you it would be wrapped-up in the light it “generated” and if it was traveling away from you some of the light would “hang there” in space not moving and other light would be traveling at twice the speed of light.

jessifer1212's avatar

If you traveled for a year then a year would pass. You would just travel one light year. I think that the perception of time stopping when at the speed of light would just come if you were running around at the speed of light, and you’re moving so much faster than everybody else that time appears to be stopped. That is, if you could control how you move when running around this fast. I can’t imagine being able to.

RandomMrdan's avatar

No, it’s how time travel is possible, time passes faster for everyone here on earth.

@zyx assume you were traveling at 99% speed of light then.

Zyx's avatar

@anothermember the light it generated? what? it would be invisible because it would be frozen in time, including it’s ability to generate light.

@RandomMrdan Time travel isn’t necessary or possible in our universe. But the answer to your question is still in the link I posted.

RandomMrdan's avatar

@zyx it is mathematically possible to travel into the future by traveling at very fast speeds, or by being near larger masses of gravity. Speed being a much more intense form.

The LHC proves it. It speeds up particles near speed of light, and they last several seconds, something like 15 seconds. Whereas without that speed, they’d be here and gone in small fractions of a second. To that particle, they still live that same fraction of a second, but to us, it takes about 15 seconds.

Zyx's avatar

@RandomMrdan That’s relativity and I know all about it but it’s not time travel.

RandomMrdan's avatar

Relativity or not, if I age a year, and everyone else I know is aged 20 years, and when I get back, the Calendar has moved forward. You have moved forward in time faster than everyone else on Earth. Sure sounds like a form of time travel.

Zyx's avatar

@RandomMrdan Actually you haven’t moved in time, you’ve just moved in spacetime which isn’t very impressive. Time travel isn’t going to happen until we find the antitime or at least some equivalent.

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