The electromagnetic spectrum consists of

A range of colors formed when white light passes through a prism is called a

Both reflecting and refracting telescopes are designed to

Reflecting telescopes differ from refracting telescopes in having

A light-year is

Parallax is used to determine a star’s

Characteristics used to classify stars include

What color are the coolest stars?

A star is born when

The lifetime of a star depends on its

A supernova is the explosion of a dying

The absolute brightness of a star depends on its

The Hertzsprung-Russell diagram shows that main-sequence stars

Why are many large optical telescopes located on mountains?

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