Explore the wonders of distant galaxies.
What Is a Galaxy?
A galaxy is a massive collection of stars, planets, gas, dust, and dark matter held together by gravity. Galaxies come in many shapes and sizes, from elegant spirals to giant ovals and chaotic clouds. Our Sun is just one of the billions of stars inside the Milky Way, which is only one galaxy among the hundreds of billions that fill the universe.
Different types of galaxies
“Galaxies come in many shapes and sizes. Here are the main types scientists have identified.”