Hubble's law expresses a relationship between __________.
answer
the distance of a galaxy and the speed at which it is moving away from us.
question
We can always determine the recession velocity of a galaxy (at least in principle) from its redshift. But before we can use Hubble's law, we must first calibrate it by __________.
answer
measuring the distances to many distant galaxies with a standard candle technique.
question
Suppose that you measure a galaxy's redshift, and from the redshift you determine that its recession velocity is 30,000 (3×10 4 3 times 10^4) kilometers per second. According to Hubble's law, approximately how far away is the galaxy?
answer
1.4 billion light-years
question
Based on what you have learned, which of the following best describes the meaning of Hubble's constant?
answer
it describes the expansion rate of the universe, with higher values meaning more rapid expansion.
question
Where are large dust clouds predominantly located in the galaxy M51?
answer
within or on the edges of the spiral arms
question
Where are the ionization nebulae predominantly located in the galaxy M51?
answer
within or on the edges of the spiral arms of the galaxy
question
Why are the ionization nebulae so bright?
answer
They are regions where gas is ionized by hot, young stars.
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