Unit 4 - Life Out There

Match the definition with the word

j

i

h

g

f

e

c

d

b

a

Planet

Comet

Space

Galaxy

Universe

Extraterrestrials

Orbit

Solar system

Journey

Atmosphere

Earth is the only ​ (a)   in the solar system known to support life.

• planet
• orbit
• galaxy

The moon's ​ (a)   around Earth affects ocean tides.

• orbit
• universe
• milky way

Our ​ (a)   consists of the Sun, eight planets, and numerous smaller celestial bodies.

• solar system
• galaxy
• planet

The ​ (a)   of Venus is thick with clouds of sulfuric acid, making it inhospitable.

• atmosphere
• orbit
• solar system

The Milky Way is the ​ (a)   that contains our solar system.

• galaxy
• orbit
• journey

Scientists believe the ​ (a)   is expanding after the Big Bang.

• universe
• space
• comet

Halley's ​ (a)   is visible from Earth roughly every 76 years.

• Comet
• Debate
• Data

The astronauts embarked on a perilous ​ (a)   to the moon in 1969.

• journey
• orbit
• galaxy

​ (a)   is a vast, largely unexplored frontier full of mysteries.

• Space
• Universe
• Data