Fall 2023 Astro 150 Final Review Part 2

What stage of evolution does a 1 solar mass star spend the most time on?

• Formation

• Main Sequence

• Red giant

Which types of black holes do we have evidence for, or think we do?

• Stellar Mass Black Holes

• Intermediate Mass Black Holes

• Supermassive Black Holes

• Primordial Black Holes

What is our primary source of gold in the Universe?

• Merging neutron stars

• The US Olympic teams

• Supernovae

• Nuclear fusion

With our current estimates of the different parts of the Drake equation, which of the following is most likely true?

• Number of communicating civilizations ≈ Years that this civilization has been communicating

What time and place is the final at?

• December 11, 12 PM - 2 PM, Physics room 3

• December 11, 12 PM - 2 PM, Physics room 3

• December 11, 12 PM - 2 PM, Physics room 3

• January 9, 3 AM - 6 AM, International Space Station

What is the escape velocity of a black hole?

• 11.3 km/s

• 600 km/s

• 300,000 km/s

• 200,000 km/s

What happens to a star at the end of its life given its initial mass was between 8 and 25 solar masses?

• It goes supernova and its core becomes a black hole

• It goes kilo-nova and its core becomes a neutron star

• It goes supernova and its core becomes a neutron star

• Its core becomes a white dwarf and produces a planetary nebula

How does time appear to pass for an astronaut falling into a black hole from the perspective of an outside observer?

• Time passes the same

• Time passes slower

• Time passes faster

• Time reverses

Which of the following does not contribute to our understanding of the shape of the Milky Way?

• Looking at stars and HI (21 cm) emission lines

• Use distances (e.g., via parallax)

• The kinematics of Andromeda

• Determine positions and velocities of clouds and stars

• Use Doppler shifting

How do we know that dark matter exists within the Milky Way?

• We do no have evidence to support this idea

• We see a large halo of material around the Milky Way that obscures our view of distant galaxies

• Stars near the central bulge are moving faster than expected

• Stars at the far edge of the disk are moving faster than expected