When most of us learn about the solar system, it seems like a pretty well-ordered place. Our sun formed first, about five billion years ago, and the planets appeared a little later. As a very general ...

Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though ...

Interstellar comet 3I/ATLAS shows odd traits—anti-tail, strange acceleration, unusual chemistry—prompting scientists to warn ...