Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

At the center is the sun, a yellow dwarf star that contains 99.8% of the solar system's mass. Everything else — from the eight major planets to dwarf planets, comets, asteroids, and icy objects ...

In April 2011, Makemake – one of five dwarf planets in our Solar System – passed between Earth and a distant star. Using seven telescopes, an international team of astronomers observed the ...