- #1
- 21
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Hi,
We know that gravity affects time and the presence of big masses such as planets will cause big distortions in spacetime wich slows things down (if I'm floating in space, won't I be distorting spacetime for.. say.. an ant? Won't the ant gravitate towards me?).
Anyway. we know that velocity also affects time, and if I'm travelling very close to the speed of light, time would go slower for me than people on Earth. But only the speed of light is constant, everything else is relative to another frame of reference. So if I say the Earth is travelling at N km/h, that would have to be relative to something (perhaps the Sun). So, in order for me to be travelling at 99% of the speed of light, what reference frame am I using? Earth? I need to be going at the speed of the Earth, plus the 99% of the speed of light? And wich velocity of Earth? Relative to what?
Thanks
We know that gravity affects time and the presence of big masses such as planets will cause big distortions in spacetime wich slows things down (if I'm floating in space, won't I be distorting spacetime for.. say.. an ant? Won't the ant gravitate towards me?).
Anyway. we know that velocity also affects time, and if I'm travelling very close to the speed of light, time would go slower for me than people on Earth. But only the speed of light is constant, everything else is relative to another frame of reference. So if I say the Earth is travelling at N km/h, that would have to be relative to something (perhaps the Sun). So, in order for me to be travelling at 99% of the speed of light, what reference frame am I using? Earth? I need to be going at the speed of the Earth, plus the 99% of the speed of light? And wich velocity of Earth? Relative to what?
Thanks