The proper interpretation of the Hubble law (which relates the redshift of a galaxy to its distance) is that as time goes on, galaxies are____.
a. staying relatively still in space while the space between the galaxies contracts
b. moving away from a common center in space that is neither expanding nor contracting
c. staying relatively still in space while the space between the galaxies expands
d. moving away from a common center while the space between the galaxies expands
e. moving toward a common center in space that is neither expanding nor contracting
Question 2
The pink color of the chromosphere is produced by the combined light of three emission lines of hydrogen: ____.
a. red, magenta, and violet
b. red, blue, and violet
c. indigo, blue, and red
d. blue, green, and yellow
e. green, blue, and violet
Species richness decreases with distance from the source pool.
Mars's average distance from the Sun is roughly 230 million km (1.5 AU) and its orbital period
Using Parallax to Determine Distance
The Host Galaxy of a Gamma-Ray Burst
Having a time zone map located near the telephone will assist you when making long distance calls ou
Fornax Galaxy Cluster