unit 7 vocab 1

What is the term for a real or imaginary line through the center of an object?

• orbit

• axis

• galaxy

• probe

What do we call a blanket of gas surrounding a planet?

• atmosphere

• debris

• terrain

• satellite

Which word describes flying or moving around in a circle?

• rotate

• orbit

• frigid

• billion

What is the surface of the land and its features called?

• galaxy

• terrain

• probe

• axis

What are natural or man-made objects that orbit around another planet called?

• satellites

• astronomers

• debris

• galaxies

What is a tool used to explore something, such as outer space?

• probe

• axis

• atmosphere

• terrain

Which word means extremely cold?

• frigid

• rotate

• billion

• orbit

What is a very large cluster of billions of stars, dust, and gas called?

• galaxy

• satellite

• debris

• probe

Who is a scientist that studies stars, planets, and outer space?

• astronomer

• probe

• satellite

• axis

What word describes a very large number?

• billion

• frigid

• rotate

• orbit