Chapter 31 Study Guide

What is the overall shape of the Milky Way Galaxy?

• sphere

• straight line

• oval

• disk

What is the name of the cluster that the Milky Way belongs to?

• the Spiral Group

• the Virgo Group

• the Local Group

• the Super Group

The Sun is ___________.

• a red giant

• a Population 1 star

• a Population 2 star

• made 99.9 percent helium

Where are the oldest stars in the galaxy located?

• black holes

• halo and bulge

• spiral arms

• bulge only

What are the oldest-known objects in the Milky Way?

• active galactic nuclei

• dwarf ellipticals

• globular clusters

• black holes

What do astronomers use to map the shape of the Milky Way?

• visible light

• infrared rays

• radio waves

• gamma rays

What is located at the center of the Milky Way?

• gamma rays

• supermassive black hole

• supernova

• gas clouds

How many stars are in the disk of the Milky Way?

• the same number that you can see with your eyes on a clear night

• 1 million

• 100,000

• 100 billion

Where are the youngest stars of the galaxy located?

• central bulge

• black holes

• halo

• spiral arms

Why do variable stars pulsate in brightness?

• gain in mass

• expansion and contraction of their outer layers

• constant contraction

• movement at a fixed rate