Learn About Galaxies

Galaxies(def.): A gravitationally-bound system of stars, gas, dust and dark matter.

There are billions of galaxies throughout the Universe and they come in different shapes and sizes. Within these galaxies are black holes, neutron stars, and bubbles of hot gas that reveal themselves in X-rays. Astronomers use Chandra to study galactic behavior and phenomena. More >

Galaxies Blog
fiery star outburst in outer space