Vocabulary Quiz-Wonder of Outer Space

what is a person who studies celestial objects?

• biologist

• scientists

• astronomer

the force of attraction between two objects

• force

• pulsar

• gravity

a huge ball of gas that produces heat and light

• infrared light

• comet

• star

everything that exists anywhere

• planet

• star

• universe

a celestial body that orbits a star and is the only object in its orbit

• moon

• planet

• comet

Theory that a sudden event caused the beginning of the universe

• Big Bang

• Theory of Evolution

• Continental Drift

a cluster of millions of stars bound together by gravity

• solar system

• galaxy

• satellite

The Spiral galaxy in which our solar system exists

• Black Eye

• Milky Way

• Whirlpool

invisible region in space with a strong gravitational field

• galaxy

• universe

• black hole

The largest public space research program

• Green Bank

• NASA

• Compton Gamma Ray Observatory