Based on star counts, 100 years ago most astronomers thought:
A)we lay about 30,000 ly out from the center of the Galaxy.
B)we lay near the center of a disk about 10 kpc wide and 2 kpc thick.
C)we lay in a spiral arm of the largest galaxy in the universe.
D)we lay near the edge of the only galaxy in the universe.
E)we were not a part of any structure larger than the known solar system.

Question

Quizplus · Accepted Answer

100 years ago, most astronomers believed that we lay near the center of a disk-shaped galaxy about 10 kpc wide and 2 kpc thick. This was based on star counts, which suggested that there were more stars in the central region of the Milky Way than in other parts of the sky. However, this view has since been revised based on more advanced observational techniques.

Based on Star Counts, 100 Years Ago Most Astronomers Thought