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My problem isn't with the time dilation, it's with the fact that the planet(oid?)'s gravity was only 1.3x that of Earth yet time was dilated to the point that 1 hour was 7 years. The math just doesn't line up.
Big disclaimer: I'm not a physicist. Those who know better should feel free to correct inaccuracies.
The difference is the reference frame. On the planet you feel the planet's gravity, you don't feel the black hole's gravity because you're in orbit around it, even though you're definitely influenced by it. The time dilation is caused by the black hole's massive gravity distorting spacetime in its surrounding area relative to other things, so the planet's gravity really has nothing to do with it.
Think of it this way - if I'm in a car moving at 100kph in the direction the earth is spinning. Technically from the perspective of someone standing still relative to the earth I'm actually moving at the speed of earth's rotation + 100kph. That's a little under mach 2, but to the person in the car it doesn't feel that way because these forces are constant. You are technically in a consistent freefall. along with the earth.
Yes, but the issue here is why would the time dil;ation on the surface be so vastly different to the orbiting spacecraft? They are both within the almost the same gravitation as related to the blackhole.
Are you saying that the surface experience of blackholeG+1.3G gives you this much time dilation compared to the orbiting spacecraft's blackholeG?
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[–] RevanProdigalKnight ago
My problem isn't with the time dilation, it's with the fact that the planet(oid?)'s gravity was only 1.3x that of Earth yet time was dilated to the point that 1 hour was 7 years. The math just doesn't line up.
[–] SkepticalMartian [S] ago (edited ago)
Big disclaimer: I'm not a physicist. Those who know better should feel free to correct inaccuracies.
The difference is the reference frame. On the planet you feel the planet's gravity, you don't feel the black hole's gravity because you're in orbit around it, even though you're definitely influenced by it. The time dilation is caused by the black hole's massive gravity distorting spacetime in its surrounding area relative to other things, so the planet's gravity really has nothing to do with it.
Think of it this way - if I'm in a car moving at 100kph in the direction the earth is spinning. Technically from the perspective of someone standing still relative to the earth I'm actually moving at the speed of earth's rotation + 100kph. That's a little under mach 2, but to the person in the car it doesn't feel that way because these forces are constant. You are technically in a consistent freefall. along with the earth.
[–] fgutrfgu ago
Yes, but the issue here is why would the time dil;ation on the surface be so vastly different to the orbiting spacecraft? They are both within the almost the same gravitation as related to the blackhole.
Are you saying that the surface experience of blackholeG+1.3G gives you this much time dilation compared to the orbiting spacecraft's blackholeG?