Astronomy 101 Exam 4 questions and
Verified Answers
Herschel's attempt to map the Milky Way by counting stars led to an inaccurate estimate of
the galaxy's size because he was unaware of absorption of interstellar dust. - ANSWER true
The galactic disc contains only old stars. - ANSWER false
The most likely explanation of the high speed motion of stars and gas near the galactic center
is that they are orbiting a supermassive black hole. - ANSWER true
Most of the mass of the Milky Way exists in the form of: - ANSWER dark matter
Hubble's law states that: - ANSWER the greater the distance to a galaxy, the greater the
galaxy's redshift
Within 30 million pc of the Sun, there are about: - ANSWER a few thousand galaxies
Hubble's law implies that the universe will expand forever. - ANSWER false
Deep surveys of the universe indicate that the largest structures in space are about 50 Mpc
in size. - ANSWER false
The theory of inflation predicts that the density of the universe is exactly equal to the
critical density. - ANSWER true
The microwave background radiation last interacted with matter around the time of
decoupling. - ANSWER true
Verified Answers
Herschel's attempt to map the Milky Way by counting stars led to an inaccurate estimate of
the galaxy's size because he was unaware of absorption of interstellar dust. - ANSWER true
The galactic disc contains only old stars. - ANSWER false
The most likely explanation of the high speed motion of stars and gas near the galactic center
is that they are orbiting a supermassive black hole. - ANSWER true
Most of the mass of the Milky Way exists in the form of: - ANSWER dark matter
Hubble's law states that: - ANSWER the greater the distance to a galaxy, the greater the
galaxy's redshift
Within 30 million pc of the Sun, there are about: - ANSWER a few thousand galaxies
Hubble's law implies that the universe will expand forever. - ANSWER false
Deep surveys of the universe indicate that the largest structures in space are about 50 Mpc
in size. - ANSWER false
The theory of inflation predicts that the density of the universe is exactly equal to the
critical density. - ANSWER true
The microwave background radiation last interacted with matter around the time of
decoupling. - ANSWER true
