But as astronomers find more and more examples of type Ia explosions, including with Kepler, they realize not all are created equal. While some of these supernovae happen when a white dwarf robs its companion of too much matter, others are the result of two white dwarfs merging. In fact,...
Other mysteries include how gravity is related to the other three main forces in the universe: electromagnetism and the strong and weak forces that operate in the atomic nucleus. Today they're explained by separate theories. A theorized particle, the graviton, that might carry the gravitational fo...