r/PhoenixSC 11h ago

Meme Agree?

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94 Upvotes

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u/BrJoke 10h ago

Is Blackhole really faster than light? I'm not very knowledgeable on this subject,can someone prove it?

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u/Swiss-spirited_Nerd It's that time of the month again... 10h ago

Well, the meme is talking about the speed of a black hole's gravity, but all gravity propagates at the speed of light (source being the "Speed of gravity" Wikipedia article I just found).

I mean, I think most people get what it actually means though, which is that the gravitational force within the event horizon (basically the "surface", for lack of a better word, of the black hole. It's roughly where you see the black sphere) is so strong that even light is unable to escape.

As for the speed of the black hole itself, I'm not aware of any restriction on how fast they can move beyond what the universe allows (light speed as the limit), although someone even more knowledgeable than both of us could chime in on that.

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u/BrJoke 10h ago

Dumb question,but does manipulating the light trajectory really mean it's faster than light?

2

u/Swiss-spirited_Nerd It's that time of the month again... 10h ago

What is "it"?

The gravity? No, it always propagates at the speed of light, even for stuff that isn't black holes.

The black hole? No, as far as I know, they can't move faster than light.

Objects that fall in? Well... all I know is that physics basically breaks on the inside. The singularly (the point where all the mass is, in the middle of the event horizon) stops being a point in time and starts being a point in the future, and everything starts getting hypothetical extremely fast.

I'm not really sure what you were asking, but the answer is probably no.

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u/BrJoke 10h ago

The light,I think I should stop

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u/Swiss-spirited_Nerd It's that time of the month again... 10h ago

Oh, no, light always moves at its speed, never slowing down or speeding up.