The first though is that gravity is the result the deformation of space.time due to a mass. But this does not answer why a mass can deform it. This must imply some particle that causes it (graviton?). This is what they are investigating and whether an anti-particle also exists. But this has not yet left the blackboard and the laboratory.
Until now all the atoms and particles that were previously scientifically predicted have been found.
Nobody knows what gravity is yet.
The first though is that gravity is the result the deformation of space.time due to a mass. But this does not answer why a mass can deform it. This must imply some particle that causes it (graviton?). This is what they are investigating and whether an anti-particle also exists. But this has not yet left the blackboard and the laboratory.
Until now all the atoms and particles that were previously scientifically predicted have been found.
In some theories like conformal gravitation the graviton doesn’t exist.