Unit 4 Life Out There (Vocabulary review)

A cloud of rock, ice, and gas that orbits the sun is the definition of _________

• Comet

• Milky Way

• Galaxy

• Space

The sun and the planets make up the ___________

• atmosphere

• universe

• solar system

• galaxy

The empty area outside Earth's atmosphere, where the planets and the stars are is called ____________

• galaxy

• universe

• atmosphere

• space

A ____________ need an atmosphere to support life.

• Space

• Comet

• Planet

• Galaxy

Scientists do not agree. They __________ whether life was ever exist on Mars

• orbit

• search

• communicate

• debate

You need two or more people to do this activity.

• search

• communicate

• journey

• find

You can live and do research in this thing.

• Spacecraft

• Rocket

• Universe

• Space station

Scientists use SETI to ____________ for extraterrestrial intelligence.

• Search

• Debate

• Find

• Communicate

A creature that lives on a planet that is not Earth is called ____________

• atmosphere

• extraterrestrial

• astronaut

• planet

Scientists have sent instruments to Jupiter to collect ____________

• Space

• Data

• Comet

• Orbit