What do you call a huge collections of stars, gas, and dust that travel together through space?

Galaxies are the ________ of the universe.

Astronomers classify galaxies based on _______.

This type of galaxy looks like a slightly flattened ball and has older stars than other types of galaxies.

These galaxies are shaped like flattened disks that have one or more spiral arms that branch out from their centers.

Galaxies with no regular shape are called _______ galaxies and are smaller and fainter than other types of galaxies.

All the stars you can see in the night sky with the naked eye are a part of our home galaxy, the _______.

The Milky Way galaxy contains about ________ stars.

The distance of the Milky Way galaxy from edge to edge is about ________.

In our galaxy, our solar system is found in _______.

Ancient peoples saw a band of stars stretching across the sky and thought it looked like a river of milk. This is known as the ________ .

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