Galaxies A galaxy is a huge group of stars, dust, gas, and other celestial bodies bound together by gravitational forces. There are spiral, elliptical, and irregularly shaped galaxies. Galaxies contain anywhere from 100,000 to 3,000,000,000,000 stars.
Galaxies radiate a continuous spectrum of energy.
The Earth , Sun and the rest of our solar system are a tiny part of the Milky Way Galaxy , a spiral galaxy. The Milky way Galaxy is just one galaxy in a group of galaxies called the Local Group . As stated in our privacy policy , we fully respect your privacy and will not use your e-mail address for any purpose other than the newsletter subscription.