Unit 9

Question 1

a mixture of gases that surrounds a planet or moon.

Answer 1

atmosphere

Question 2

a force of attraction between objects that is due to their masses.

Answer 2

gravity

Question 3

changes that must be made in an environment to maintain livable conditions for humans

Answer 3

accommodations

Question 4

humans onboard spacecraft

Answer 4

manned space exploration

Question 5

continuous physical force exerted on or against an object by something in contact with it

Answer 5

pressure

Question 6

closeness

Answer 6

proximity

Question 7

the energy we get from the sun, includes an infrared and ultraviolet energy

Answer 7

radiant energy

Question 8

measurement of heat

Answer 8

temperature

Question 9

sun, planets, and all the other objects that revolve around the sun

Answer 9

solar system

Question 10

condition in which people or objects appear to be weightless

Answer 10

microgravity

Question 11

range of orbit around a star in which a planet can support liquid water

Answer 11

habitable zone