The theory of relativity was developed by Albert Einstein in the early 1900s due to the inability of classical physics to explain certain observations. It has two components, special relativity and general relativity.
Special relativity is based on the key concepts of a constant speed of light and physical events must look the same to all observers and applies to all physical phenomena without significant gravitation. General relativity is the idea that space and time are two aspects of spacetime, and what we perceive as gravity is the warping of spacetime.
“What this research is telling us is that we have a funny motion, but that funny motion is consistent with everything we know about the universe—there’s nothing special going on here,” said Darling. “We’re not special as a galaxy or as observers.”