Maps of the Galactic Plane
- 'Terragen Expansion'
- Galactic Core
- Galactic Directions
- Galactic History
- Galactic Information Bank
- Galaxy
- Galaxy Brain
- Galaxy, Irregular - Text by M. Alan Kazlev
A galaxy of amorphous or chaotic appearance, possessing large clouds of gas and dust, and both Population I and Population II stars, but no spiral arms or nucleus. They are thought to result from a collision with a larger galaxy, pulling them out of shape. Most have relatively low mass (about a hundred million to ten billion stars). About 25% of all galaxies are irregular.
- Galaxy, Spiral - Text by M. Alan Kazlev
A disk-shaped galaxy with a spiral pattern of arms, typically containing 1010 or more solar masses of stars, dust, and gas.
- Interstellar Econometrics
- Milky Way
- Orion Arm, Orion Spur
- Terragen
- Terragen Sphere
Text by Steve Bowers
Initially published on 27 February 2011.