> I learnt that gravitation bends space-time and that's why light rays seem to be bent. If gravitation is just waves too, then how does that work and who bends

> I learnt that gravitation bends space-time and that's why light rays seem to be bent. If gravitation is just waves too, then how does that work and who bends the gravitational waves. I think your confusion comes from your thinking that the same word ("wave") is always used for the same effect. In your few sentences the "wave" is the word which is used for completely different effects and scales: For the gravitational waves that we measure we don't have to worry about some single "gravitation particle". The gravitational wave detectors don't have to care "if gravitation particles (gravitons) exist" as that's on completely another scales, you can imagine these (measured) waves as being created by such an immense number of "gravitons" that these are surely not seen. If you want some analogy: you know that for people to think easier about the spacetime curvature due to the gravitation one says imagine a 2D membrane with a ball on it (representing a star or a black hole or some other big object) curving the membrane. Now what are the events LIGO detects: imagine two balls, rotating one around another, resulting in the ripples on the membrane, just like two fast boats circling produce interesting waves on the surface of the lake. LIGO detects such ripples. So the curvatures due to the masses always exist, but the huge masses moving around produce the ripples in the spacetime (it's just the shape of the curvature that changed in the different time points). That is not "gravitation is just waves too" that's: we see the ripples independently of the existence or non-existence of the gravitons on the quantum level. To go back to the "boats on the lake" example, you detect the waves of the whole lake surface, and on that level to observe these waves it's irrelevant to you that the water is made of molecules, that the molecules are made of the atoms, that the atoms are made of the particles, and that there are the experiments that demonstrate the quantum nature ("wave"-like nature) of the said particles. The difference in the orders of magnitudes between the waves LIGO detects and quantum "wave"-like particles is immense, so big that there aren't any simple examples I can imagine.