Unit 7 Vocab Flashcard 1

Front

What does the word 'orbit' mean?

Back

To fly or move around in a circle.

Front

What is a 'galaxy'?

Back

A very large cluster of billions of stars, dust, and gas held together by gravity.

Front

What is a 'probe'?

Back

A tool used to explore something, such as outer space.

Front

What does 'axis' refer to?

Back

A real or imaginary line through the center of an object.

Front

What does the term 'billion' mean?

Back

A very large number, specifically 1,000,000,000.

Front

What is the definition of 'rotate'?

Back

To turn around a center point.

Front

What are 'satellites'?

Back

Objects that orbit around a planet or star.

Front

What is 'debris'?

Back

Scattered pieces of waste or remains.

Front

What does 'atmosphere' mean?

Back

The layer of gases surrounding a planet.

Front

What is a 'terrain'?

Back

The physical features of a piece of land.