Shell Galaxy
An elliptical galaxy wrapped in stellar shells, the sharp ripples left by a merger.
All Scenarios, page 253
3D Space and Gravity Simulator. Simulate the solar system, exoplanets and even colliding galaxies. Add, delete and modify planets, and change the laws of physics.
Spiral Galaxy Sa
A tightly wound Sa spiral. A large red bulge dominates, and narrow blue arms lie close to the disk.
Spiral Galaxy Sb
An Sb spiral with a moderate bulge, broader arms, and both young blue stars and an older yellow disk.
Spiral Galaxy Sc
An open Sc spiral. The bulge is small, the arms are loose, and most of the blue light sits in the arms.
Barred Spiral Galaxy SBa
A barred Sa. An oval lens of old stars sits inside tightly wound arms.
Barred Spiral Galaxy SBb
A barred Sb. A straight bar of old stars, with two arms leaving its ends.
