Which of these galaxies would you most likely find at the center of a large cluster of galaxies?
answer
a large elliptical galaxy
question
We determine the distance of a Cepheid by
answer
determining its luminosity from the period-luminosity relation and then applying the inverse square law for light
question
Which kind of object is the best standard candle for measuring distances to extremely distant galaxies?
answer
a white dwarf supernova
question
Why do virtually all the galaxies in the universe appear to be moving away from our own?
answer
Because expansion causes all galaxies to move away from nearly all others.
question
Which of these galaxies is most likely to be oldest?
answer
a galaxy in the Local Group
question
When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching Earth, we are seeing that galaxy as it was when the universe was
answer
4 billion years old
question
What is a key assumption in our most successful models for galaxy formation?
answer
Some regions of the universe were slightly denser than others.
question
Observations indicate that galaxies with more massive central black holes tend to also have
answer
a greater mass of stars in their central bulges
question
The luminosity of a quasar is generated in a region the size of
answer
the solar system
question
The primary source of a quasar's energy is
answer
gravitational potential energy
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