ASTRO 7N - UNIT 4 PART 2 (quiz)
What parameters do Hubble's law relate to each other? - correct answer galaxy recession velocity and distance
What technique for measuring distance can you use to discover Hubble's law? - correct answer Cepheid variables in galaxies white dwarf supernovae in galaxies
A&B
How do you measure the speed of a galaxy relative to you? - correct answer Doppler shifts
What is Hubble's law? - correct answer The faster a galaxy is moving, the farther away it is.
Where is the center of the Universe? - correct answer There is no center to the Universe. Expansion is happening everywhere.
How have astronomers interpreted the unexpectedly fast rotation of galaxies? - correct answer There must be a lot of dark matter whose gravity can be felt but not seen
Which of the following is not true about dark matter? - correct answer Dark matter and dark energy are two aspects of the same phenomenon
Why do we think there is a lot of dark matter in clusters of galaxies? - correct answer Individual galaxies are moving so fast that they could not be held together by the gravity of visible matter
Gravitational lensing lets us measure mass even when we can't see it.
A&C
How do we know that the universe's expansion is speeding up? - correct answer We look at objects from
different times in the past to see how expansion changes with time
What parameters do Hubble's law relate to each other? - correct answer galaxy recession velocity and distance
What technique for measuring distance can you use to discover Hubble's law? - correct answer Cepheid variables in galaxies white dwarf supernovae in galaxies
A&B
How do you measure the speed of a galaxy relative to you? - correct answer Doppler shifts
What is Hubble's law? - correct answer The faster a galaxy is moving, the farther away it is.
Where is the center of the Universe? - correct answer There is no center to the Universe. Expansion is happening everywhere.
How have astronomers interpreted the unexpectedly fast rotation of galaxies? - correct answer There must be a lot of dark matter whose gravity can be felt but not seen
Which of the following is not true about dark matter? - correct answer Dark matter and dark energy are two aspects of the same phenomenon
Why do we think there is a lot of dark matter in clusters of galaxies? - correct answer Individual galaxies are moving so fast that they could not be held together by the gravity of visible matter
Gravitational lensing lets us measure mass even when we can't see it.
A&C
How do we know that the universe's expansion is speeding up? - correct answer We look at objects from
different times in the past to see how expansion changes with time
