Comment on Gottem. :)

TheOakTree@lemm.ee ⁨2⁩ ⁨days⁩ ago

• Voyajer@lemmy.world ⁨2⁩ ⁨days⁩ ago

  After 8 minutes

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• mipadaitu@lemmy.world ⁨2⁩ ⁨days⁩ ago

  scienceprimer.com/lunar-and-solar-tides

  Yes, the tidal effect of the sun would disappear, and that would probably make the oceans all fucky suddenly (after an 8 minutes lag).

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  • Alk@sh.itjust.works ⁨2⁩ ⁨days⁩ ago

    Does gravity travel at the speed of light?

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    • Revan343@lemmy.ca ⁨2⁩ ⁨days⁩ ago

      Of course. It can’t travel faster

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    • cantstopthesignal@sh.itjust.works ⁨2⁩ ⁨days⁩ ago

      Yes. General relativity.

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    • stebo02@lemmy.dbzer0.com ⁨2⁩ ⁨days⁩ ago

      The speed of light is more than just the speed of light. Nothing can travel faster than the speed of light. Not particles, not gravitational waves (waves and particles are actually kinda equivalent anyway), not any kind of “information”. If two events occur in a way that a particle would have to travel faster than the speed of light to travel between them, then it’s impossible for one of those events to be caused by the other. They must be unrelated. So the soonest we will see any effect of the sun blipping out of existence, whatever the medium (light/gravity/…) is after 8 minutes.

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      • Alk@sh.itjust.works ⁨2⁩ ⁨days⁩ ago

        What about quantum entanglement? Is that also limited to the speed of light?

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    • cuerdo@lemmy.world ⁨2⁩ ⁨days⁩ ago

      The gravity does travel, the gravity is.

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      • davidgro@lemmy.world ⁨2⁩ ⁨days⁩ ago

        Changes in the gravitational field definitely travel, and do so at the speed of light.

        Look up LIGO

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      • Alk@sh.itjust.works ⁨2⁩ ⁨days⁩ ago

        If it didn’t travel, it wouldn’t take 8 minutes to stop right?

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• apotheotic@beehaw.org ⁨2⁩ ⁨days⁩ ago

  After 8 minutes, almost certainly

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• itslilith@lemmy.blahaj.zone ⁨2⁩ ⁨days⁩ ago

  Gravity isn’t a force, strictly speaking. Objects move along geodesics in spacetime (that’s basically a straight line along a curved surface), and gravity bends spacetime, and therefore also these geodesics, around massive objects. So you don’t actually get accelerated by gravity, that’s why you don’t feel anything during free fall. What we perceive as the force of gravity pushing us down, is the solid ground accelerating us upwards, when following the geodesic would have us fall instead.

  So when the sun disappears, the geodesic that used to spiral around the sun suddenly straightens out, and the neutral movement, the new free fall, has the earth continuing in a straight line. You wouldn’t be able to feel that. What the other person said about tidal forces is true tho, it would likely cause worldwide tsunamis

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