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- 1. Multiple Choice
Hubble's Law states that galaxies are receding away from us at a speed that is proportional to their
size
mass
wavelength
distance
- 2. Multiple Choice
Hubble's Law enables astronomers to estimate the distance to a galaxy if they can determine that galaxy's
mass
temperature
spectral type
velocity of recession
- 3. Multiple Choice
According to Hubble's Law, more rapidly moving galaxies are now
closer to us
accelerating rapidly
further away from us
being pulled into black holes
- 4. Multiple Choice
What is the explanation for the high redshifts observed in distant objects
They are rapidly moving away from us.
Their light has been gravitationally redshifted.
Their light has lost energy over time while traveling this distance.
In the time it took their light to reach us, the universe expanded and, thus, their wavelengths.
- 5. Multiple Choice
A star that is moving toward the earth will have which of the following?
Dim lines
Unshifted lines
Red shifted lines
Blue shifted lines
- 6. Multiple Choice
You observe two galaxies. galaxy X has a recessional velocity of 1000 km/s while galaxy Y has a recessional velocity of 2000 km/s. Based on this information, which of the following is true?
galaxy X is 4 times as far away as galaxy Y
Galaxy Y is 4 times as far away as galaxy X
Galaxy X is 2 times as far away as galaxy Y
Galaxy Y is 2 times as far away as galaxy X
- 7. Multiple Choice
According to Hubble's Law, if galaxy B is three times farther away from us than galaxy A, then galaxy B will
move toward us nine times faster than A
move toward us three times faster than A
move away from us nine times faster than A
move away from us three times faster than A
- 8. Multiple Choice
A galaxy is at a of one billion light years. Which of the following is true?
We see the galaxy the way it will be in one billion years.
We see the galaxy the way it was one billion years ago.
We see the galaxy the way it was when the Universe was one billion years old
We see what our galaxy will be like in one billion years.
- 9. Multiple Choice
All galaxies are moving away from us
True
False
- 10. Multiple Choice
What is the distance to a galaxy that has a velocity of 103 km/s if H0=60km/s/Mpc?
10.4 Mpc
16.7 Mpc
19.1 Mpc
22.2 Mpc
- 11. Multiple Choice
What method would astronomers use to find the distance to a galaxy so far away that individual stars are impossible to resolve?
Parallax
Cepheid variable
using the x-ray emission from the entire galaxy
finding the redshift and using Hubble's Law
- 12. Multiple Choice
Cepheid variables are important to us in calculating
distances to galaxies
the ages of galaxies
the compositions of stars
the temperatures of stars
- 13. Multiple Choice
Which of the following is used to calculate the distance to a Cepheid variable star?
Parallax
Hubble's Law
Finding the redshift
Period-luminosity relation
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