Earth & Space
What Is a Galaxy?
200 billion stars held together by gravity. We live inside one. There are 2 trillion more.
That faint white smear in a really dark night sky? That's OUR galaxy — the Milky Way — seen edge-on from inside. Every star you can see with your eyes is a neighbor.
Concepts you just met
Milky WayAndromedaGalaxy TypesLocal Group