Glossary of
Astronomical Objects
Nebula
Stars
Planetary Nebula
The Sun
The Solar System
Moon
Asteroid
Crater
Comet
Globular Cluster
Galaxy
Galaxy Cluster
Michael Gallagher
9th December 2003
Stars
massive spheres of gas, held together by gravity. The pressure in their cores is so great that hydrogen fuses into helium and releases immense amounts of energy.
