1. The earth is constantly moving around the sun, so if you stayed the same exact place in the solar system from one day to the next, the earth would have left you behind
( Read more... )
Well, more like I can't say anything about how it would theoretically turn out without knowing how we're doing this, although as crystalpyramid points out below it's likely that something that could travel through time could just as easily travel through space anyway. I guess, without doing the calculations and just going by intuition, it's possible that going backwards in time would make gravity repulsive, while going forwards would make it stronger.
Yes, that's why atomic clocks go slower deeper into a gravitational well. It's called "gravitational time dilation." Basically gravity stretches spacetime toward it, which results in lengthening geodesics (the shortest distance between two points in spacetime; this is also the path an object naturally follows if it's not accelerating), so everything gets slower. If something's not moving (with respect to the source of gravity), all that happens is time slows down for it; if it is moving, it also has to travel a larger distance because the geodesic spatially curves toward the massive object.
Yeah, I understood what you meant by "time travel," as any reasonable person would.
Yes, that's why atomic clocks go slower deeper into a gravitational well. It's called "gravitational time dilation." Basically gravity stretches spacetime toward it, which results in lengthening geodesics (the shortest distance between two points in spacetime; this is also the path an object naturally follows if it's not accelerating), so everything gets slower. If something's not moving (with respect to the source of gravity), all that happens is time slows down for it; if it is moving, it also has to travel a larger distance because the geodesic spatially curves toward the massive object.
Yeah, I understood what you meant by "time travel," as any reasonable person would.
Reply
Leave a comment