Recent content by Zwarmapapa

But aren't photons matter without mass/gravity? And isn't dark matter mass/gravity without matter?

Let me start of with this first: I'm not a physicist, I'm a software engineer, so my knowledge about this is pretty much nihil. Anyway, my question is, why is it assumed that matter causes gravity? Is there any proof or logic behind it? What if matter and gravity are two separate things that...