Unit 4 Review - Galaxies and the Universe

How many major classes (or types) of galaxies are there?

• 2

• 3

• 4

• 5

What kind of galaxy is this?

• Ring
• Irregular
• Spiral
• Elliptical 

What kind of galaxy is this?

• Barred Spiral
• Irregular
• Peculiar
• Ring

What type of galaxy do we live in?

• Spiral
• Elliptical
• Irregular
• Coaxial

What type of galaxy is this?

• Spiral
• Elliptical
• Irregular
• Irrational

What type of galaxy is this?

• Spiral
• Elliptical
• Irregular
• Irrational

Which of the following correctly places these in order from LARGEST to SMALLEST?

• galaxy -- local group/cluster -- planet -- solar system -- universe

• universe -- local group/cluster -- galaxy -- solar system -- planet

• planet -- solar system -- galaxy -- local group/cluster -- universe

• universe -- galaxy -- solar system -- local group/cluster -- planet

A Group of stars, and or star systems, star clusters, dust and gas held together by gravity is known as:

• Universe

• Galaxy

• Solar System

• Planet

The area of the galaxy that has the most dense stars surrounding a supermassive black hole.

• Halo region

• galactic bulge

• galactic disk

• spiral density arms

The area where faint, old stars exists that surrounds the disk & bulge.

• Halo region

• galactic bulge

• galactic disk

• spiral density regions