Galaxy

Galaxies are vast systems of stars and dust held together by gravity. They are classified into spiral, elliptical, or irregular types. The Milky Way is a spiral galaxy. It is now believed that supermassive black holes exist at the center of every galaxy, consuming matter and releasing energy.

Explain the role of supermassive black holes in galaxies.

What happens to matter that is sucked into a supermassive black hole?