Overview

Massive systems containing billions of stars, gas, and dust held together by gravity.

Key Insights

Galaxies is a fascinating subject within space & cosmos. Massive systems containing billions of stars, gas, and dust held together by gravity. There are over 2 trillion galaxies in the observable universe. Galaxies come in spiral, elliptical, and irregular shapes. The Andromeda Galaxy is approaching the Milky Way. Gravity.