# How does general relativity explain gravity?

General relativity explains that gravity is the curving of spacetime by massive objects. This makes sense, like when I throw a ball, it follows the curve of spacetime, which is towards the center of the earth.

But what I’m struggling to understand is if something has no acceleration, why does it still fall towards earth? If gravity is just matter traveling through curved spacetime, then wouldn’t something with no acceleration just act like it’s in outer space (just floating)?

• It’s not a proper answer but I once heard an argument that maybe already helps: everything is moving all the time through space-time because we are moving through time even when we are not moving through space. Apr 11, 2022 at 4:45
• Maybe this video helps. It doesn’t answer your actual question but it explains the “moving through spacetime“ aspect: youtu.be/A2JCoIGyGxc Apr 11, 2022 at 5:02
• I’m voting to close this question because there is only incidental astrophysical relevance, and this question already has a good answer on Physics Please go and see physics.stackexchange.com/questions/90592/… to understand how the problems with the rubber sheet model of GR. And this comic xkcd.com/895 for the difficulty in talking about General Relativity in any terms. Apr 11, 2022 at 7:19
• For a bit more maths, physics.stackexchange.com/questions/47379/… shows how to calculate the weight of an object using GR. Apr 11, 2022 at 8:29
• This is an excellent question. But you won't get any satisfying answer to it, unfortunately. You'll mainly be told, in ways both direct and indirect, that time is somehow the accelerant. Time though is of course not a thing; it can't move anything. And so, we're really left in a weird position here. Apr 12, 2022 at 0:08