1. Our galaxy is called the ____. (1 point)
Local Group
Orion
Andromeda
Milky Way
2. About 60 percent of all known galaxies are classified as ____. (1 point)
spiral galaxies
elliptical galaxies
irregular galaxies
binary systems
3. Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that ____. (1 point)
Earth is in the center of the universe
the universe is contracting
the universe is expanding
the universe is smaller than once believed
Local Group
Orion
Andromeda
Milky Way
2. About 60 percent of all known galaxies are classified as ____. (1 point)
spiral galaxies
elliptical galaxies
irregular galaxies
binary systems
3. Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that ____. (1 point)
Earth is in the center of the universe
the universe is contracting
the universe is expanding
the universe is smaller than once believed