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Types, Properties and Examples

• What are the main types of regular galaxies?
• What distinguishes spiral galaxies from elliptical or irregular ones?
• Do spiral or elliptical galaxies have more gas and dust?
• In what sense are elliptical galaxies "all halo"?
• Which galaxies are more common in our part of the universe?
• What types of galaxies are the smallest ones?
• How can we find out the mass of a galaxy?
• Is there matter in the universe that we don't see? What evidence do we have?
• Name two examples of spiral galaxies.
• Name two examples of irregular galaxies.

Distances and Distribution

• How do we find out how the distance to a nearby galaxy?
• Which objects can be used as "standard candles" to find distances to galaxies?
• What are the Magellanic Clouds?
• How far from us is the Andromeda galaxy, M31?
• What is the local group?
• What is the Virgo cluster?
• Are galaxies arranged in any kind of pattern?
• How many galaxies are there in the part of the universe we can see?

Motion

• Can we find out the speed of galaxies?
• What is remarkable about the motion of all distant galaxies?
• What is Hubble's law?
• How fast do galaxies move away from us?
• What is the practical use for Hubble's law?
• How do we find out how the distance to a faraway galaxy?

Evolution

• Why don't we see the galaxies changing?
• Do galaxies collide?
• Is the evolution of galaxies affected by their collisions?
• Can galaxies merge?
• Can we see young galaxies?