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21 Cards in this Set

  • Front
  • Back

Apollo 11

name of first mission in which people landed on the surface of the moon

asteroid

chunk of rock which orbits the sun in an elliptical path

asteroid belt

large collection of asteroids located between Mars and Jupiter

astronomical unit (AU)

a measure of distance equal to 93 million miles

axis

imaginary slanted line that runs though the center of the planet from pole to pole

comet

mass of ice and dust that orbits the sun

comet coma

cloud of evaporated dust and gas that surrounds the comet nucleus

comet nucleus

center of comet

comet tail

visible stream of vaporized dust, ice, and gas that extends out from the comet

elliptical

oval-shaped

meteor

meteoroid that has entered the Earth's atmosphere

meteorite

meteor that has crashed into the Earth

meteoroid

small asteroid

moon phases

the parts of the moon that are visible from Earth

orbit

the movement of one space object around another

rotation

one full spin of a planet on its axis

revolution

one full orbit of the Earth around the sun

satellite

an object that orbits around another object in space

space probes

spacecraft sent from Earth to space to take pictures and gather data

spherical

shaped like a sphere; round

tides

events in which the ocean water rises and falls due to gravitational forces of the sun and moon