Astronomy: A Universe Tour

Subject: Science  ·  Grade level: 8th

From our backyard solar system to the edge of the observable universe. Astronomy is the science of everything beyond Earth. Learn how astronomers measure dist

In this lesson

• Our solar system
• Stars and their life cycles
• Galaxies and the universe
• How astronomers know what they know

Key terms

Astronomical Unit (AU)

Average Earth–Sun distance, ~150 million km.

Light-year

How far light travels in one year — about 9.46 trillion km.

Orbit

The curved path one object takes around another due to gravity.

Astronomy: A Universe Tour lesson on BrightPath

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