Unit 9 Flashcards
a mixture of gases that surrounds a planet or moon.
atmosphere
a force of attraction between objects that is due to their masses.
gravity
changes that must be made in an environment to maintain livable conditions for humans
accommodations
humans onboard spacecraft
manned space exploration
continuous physical force exerted on or against an object by something in contact with it
pressure
closeness
proximity
the energy we get from the sun, includes an infrared and ultraviolet energy
radiant energy
measurement of heat
temperature
sun, planets, and all the other objects that revolve around the sun
solar system
condition in which people or objects appear to be weightless
microgravity
range of orbit around a star in which a planet can support liquid water
habitable zone
