Astro 7N Unit 4 Part 2 UPDATED ACTUAL
Exam Questions and CORRECT Answers
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 and white dwarf supernovae
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.
What is the center of the universe? - CORRECT ANSWER - There is no center of 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 & dark energy are 2 aspects of the same phenomenon
Why do we think there's a lot of dark matter in clusters of galaxies? - CORRECT
ANSWER - Individual galaxies are moving so fast they couldn't be held together gravity
of visible matter & gravitational lensing lets us measure mass we can't see
How do we know that the universe's expansion is speeding up? - CORRECT ANSWER -
Look at objects from different times in the past to see how expansion changes
Exam Questions and CORRECT Answers
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 and white dwarf supernovae
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.
What is the center of the universe? - CORRECT ANSWER - There is no center of 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 & dark energy are 2 aspects of the same phenomenon
Why do we think there's a lot of dark matter in clusters of galaxies? - CORRECT
ANSWER - Individual galaxies are moving so fast they couldn't be held together gravity
of visible matter & gravitational lensing lets us measure mass we can't see
How do we know that the universe's expansion is speeding up? - CORRECT ANSWER -
Look at objects from different times in the past to see how expansion changes
