Lessons 23 and 24 Homework Quiz
Harlow Shapley concluded that the earth is not at the center of the Galaxy because:
The earth is not at the center of the distribution of globular clusters.
Hubble's Law states that:
The farther away a galaxy, the greater its redshift
Your instructor has discovered a previously unknown
supercluster of galaxies
The local group of galaxies
- Contains about 50 galaxies. - Includes the Milky Way Galaxy and the Andromeda Galaxy.
Roughly how far is the sun from the center of the Milky Way Galaxy?
10 kpc
What observation clinched the idea that the "spiral nebulae" were actually external galaxies rather than part of the Milky Way?
Hubble's discovery of Cepheid variables in M 31
Cepheid variables are used as distance indicators because of their
Period-luminosity relation.
Which galaxy type would generally appear most red when observed?
elliptical
Compared with a globular cluster, a galactic (open) cluster
has a lower density of stars
On a photograph of a dense part of the Milky Way, you see a dark patch which seems to contain few stars. Probably you are seeing
obscuration by a dust cloud.