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
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
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