The Classification of Galaxies

Who proved that galaxies are distant objects containing millions or billions of stars?

• Edwin Hubble

• Albert Einstein

What system is used to classify galaxies?

• The Galileo System

• The Hubble System

Which type of galaxy is known for having distinctive spiral arms?

• Elliptical Galaxies

• Spiral Galaxies

How are elliptical galaxies classified?

• By their color

• By how round they appear

What feature do barred spiral galaxies have?

• A central bar from which arms extend

• No visible arms

What does the Milky Way classify as?

• A Barred Spiral Galaxy

• A Spiral Galaxy

What are the most common galaxies in the universe thought to be?

• Irregular Galaxies

• Dwarf Galaxies

What characteristic is NOT associated with elliptical galaxies?

• Continuous star formation

• Very little gas and dust

What can cause galaxies to change their appearance over time?

• Interactions, collisions, and mergers

• Changes in the cosmic microwave background radiation

What is a key aspect of galactic evolution?

• Mergers and collisions stimulating bursts of star formation

• Galaxies moving away from each other