What is an irregular galaxy?

What do many astronomers think is at the center of our galaxy?

What are quasars?

What do astronomers think quasars are the beginnings of?

Describe the structures of a quasar.

What are two ways that galaxies change over time?

If you observe a galaxy that is 4 million ly away, you are observing light that left that galaxy how long ago?

What will our sun form when it dies?

How many more years does our sun have to live?

What stage is our sun in now?

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