“General relativity is an improved model compared with Newtonian mechanics that works much better than the latter when dealing with high velocities and large masses. It often comes up in connection with black holes, GPS and movement close to the speed of light. In general relativity, seemingly weird things can happen that we are not used to on the scale of humans, such as tid moving slower in some areas or some objects being shorter depending on their speed. One of the core principles of general relativity is that the speed of light is the same in all frames of reference.
Einstein predicted the existence of gravitational waves in the early decades of the 20th century and researchers thought that these waves could be produced from cataclysmic events in space and that detecting them could provide substantial insight into these events.”