Astro 150 Final Exam Review

The Local Group is ______

• the nearest group of stars to the solar system

• the nearest open cluster

• the Andromeda Galaxy and its companions

• the cluster of galaxies in which the Milky Way galaxy is located

Which type of galaxy is dominated by Population II stars and contains little or no gas or dust?

• Elliptical

• Spiral

• Dwarf

• Lenticular

The acronym AGN stands for _____

• All-Gas Nebula

• Astrophysically Gigantic Nebula

• Active Galactic Nucleus

• Amazing Grace Network

What can you expect to find in the ISM?

• Hydrogen

• Dust

• all of these

• Organic Molecules

What makes up most of the Mass-Energy of the Universe?

• Dark Matter

• Radiation

• Normal Matter

• Dark Energy

A Super-cluster of galaxies is about how large?

• 30,000 pc

• 150 Mpc

• 14 Gpc

• 73 pc

What is the correct chronological ordering of the following:

• Big Bang,

  Inflation,

  Recombination

• Inflation,

  Big Bang,

  Recombination

• Big Bang,

  Recombination, Inflation

• Big Bang,

  Big Rip,

  Big Crunch

At the time of the Big Bang the universe was _____

• square

• hot with a high density

• hot with low density

• cool with high density

Evidence shows that _____ % of the mass of the Milky Way is invisible (i.e. dark matter)

• 0

• 10

• 50

• 90

in comparison with the Sun, stars located in the galactic halo are expected to have ____

• none of these; we have no idea what the metal abundance is

• low metal abundance

• high metal abundance

• metal abundance similar to those in the Sun