_________ is an object whose gravity is so strong that nothing can escape it.

A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity are

The sun is part of a ______ galaxy.

The most massive stars collapse to from _______ when they die.

Astronomers typically measure the distance to stars in

Why are many large optical telescopes located on mountains?

The solar system was formed from

A star is born when

The Milky Way galaxy is an example of a(n)

What color are the coolest stars?

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