
Space & PhysicsJanuary 1, 1981
The Andromeda Galaxy
The large spiral galaxy nearest our own, it has been a laboratory for the study of the evolution of stars and galaxies. Even today it presents puzzles; for example, how are its spiral arms arrayed?

The Andromeda Galaxy
The large spiral galaxy nearest our own, it has been a laboratory for the study of the evolution of stars and galaxies. Even today it presents puzzles; for example, how are its spiral arms arrayed?

Dwarf Galaxies
The most common type of galactic system in the universe, these sparsely populated stellar assemblages have proved to be very useful in investigating the evolution of galaxies