Question about relativity

Question

I know when mass becomes massive we need general relativity. My question is why do we need to incorporate special relativity since the mass is not in high speed .Cant we have Newtons law of gravitation for massive objects(curvature of spacetime without special relativity) Or we can say Curvature of spacetime without special relativity

Or lets say curvature of Space, not time

"I know when mass becomes massive we need general relativity." What does this mean? — ACuriousMind, Sep 24 '23 at 21:11
How would that work? Newton's law doesn't "know" about spacetime, or spacetime curvature. — PM 2Ring, Sep 24 '23 at 21:11
Special Relativity is the foundation of all physics and it establishes an important idea that time needs to be treated just like space. Because of this, all physical laws need to be written in a way that this fact is true -- such as using 4-vectors. — K7PEH, Sep 24 '23 at 21:12
General relativity is a theory of gravity. See Why can't I do this to get infinite energy?. Or this What is General Relativity? — mmesser314, Sep 24 '23 at 21:14
@K7PEH Fair point, but let's try to avoid writing answers in comments. ;) — PM 2Ring, Sep 24 '23 at 21:16
Related: Can there be general relativity without special relativity? — PM 2Ring, Sep 24 '23 at 21:25
Does this answer your question? What has general relativity got to do with special relativity? — WillO, Sep 24 '23 at 21:26
@ACuriousMind - It means if an object is massive enough, we need general relativity to explain what we see. — mmesser314, Sep 24 '23 at 21:27
@PM2Ring There is the seed of a good question hidden in there, but little incentive to provide an answer to a question that looks like it will be closed very shortly (as I naively did yesterday). As a "counterbalance" to the low-gravity scenario used to match GR to Newtonian gravitation, there is a "high-G, low-speed" analysis which is well worth looking at (mostly because the low-speed approximation turns 4-tensors into manageable scalar equations). Some here might be familiar with the author . . . https://math.ucr.edu/home/baez/einstein/ — m4r35n357, Sep 26 '23 at 11:26

Question about relativity

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