Galaxy Types (and other quiz related matters)

Here is the transparency from last week's class!

Here is Edwin Hubble's Fork Diagram.

What else to know for the quiz...

• What type of galaxy are we in?
• How are the phases of the moon created?
• What is an "umbra" and a "penumbra?"
• Why don't we see more eclipses?
• Why are there tides?
• What is a magnetosphere? (We will talk about this tomorrow!)