Title: Week 6 Quiz
Course: ASTRON103: The Evolving Universe: Stars, Galaxies, and Cosmology (001) DHH SU18 > Section: Week 6

Q: If the mass of a black hole were to double, how would its event horizon change (quantitatively, by what factor will it change)? Show your work.

Q: Calculate the theoretical radius of the event horizon for Jupiter in kilometers. Show your work.

Q: Briefly explain why black holes are much easier to detect when they are in binary systems with another star.

Q: Explain why we see the Milky Way as a faint band of light stretching across the sky. What gives it the distinct fuzzy / "milky" look in the sky?

Q: Suppose the Milky Way was a band of light extending only halfway around the sky (that is, in a semicircle). What, then, would you conclude about the Sun’s location in the Galaxy? Give your reasoning.

Q: Where in the Galaxy would you expect to find Type II supernovae, which are the explosions of massive stars that go through their lives very quickly? Where would you expect to find Type I supernovae, which involve the explosions of white dwarfs? Explain?

Q: The Sun orbits the center of our Galaxy at a speed of 220 km/s in a circle with with a radius of about 26,000 light-years. Calculate the circumference of the Sun's orbit around the Galaxy and the Period for the Sun to make one full revolution. Show your work.

Q: Briefly explain why gravitational waves must exist as predicted from the precise measurement of orbits of a pulsar and neutron star binary system.

Q: What about the nature of GPS technology requires for the satellites to be aware of and make corrections for general relativity? What would happen if general relativity corrections were not made?

Q: How might our night sky be different if the Sun were located inside of a globular cluster in the Milky Way's Halo?