Does a large amount of mass in a 'small' area cause spacetime to bend inwards to the centre of mass? If so: Since the path of light changes because it is travelling with the bent spacetime, why wouldn't other moving particles also bend their path while moving in a bent spacetime? So if it is possible that this bend in spacetime causes particles that are always in motion (such as gases) to bend their path towards the centre of mass, causing gases to stay on Earth. So with this, instead of gravity pulling us down, it's just buoyancy/density + the curved path of spacetime directing motion towards the centre of earth that causes what feels like gravity. With this model, we can explain simple things such as how a bicycle works and why shower curtains blow inwards.