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Axis - An imaginary
line going from the
north pole to the south
pole. The earth
spins on this line.
Earth's Tilt - The
earth's axis is not
straight up and down;
it leans at a 23.5degree angle.
Orbit - The path that a
planet travels as it goes
around the sun.
Reflection - The
bouncing of light off of
an object. The moon
appears to shine
because it reflects the
sun's light.
Gravity - The force
that pulls the moon
toward Earth, keeps the
planets in orbit, and
attract objects towards
each other.
Satellite - A natural
satellite, or moon, is a
celestial body that
orbits another body.
Revolution - The
circling of one object
around another object
in space. A planet
revolves around the
sun. A moon revolves
around a planet.
Rotation - When a
planet or moon turns all
the way around or spins
on its axis one time.
Phase– Period of time
in a cycle or sequence
Waxing – Increasing;
growing
Waning – Decreasing;
shrinking
Crescent – Thin,
curved shape; less than
half full
Gibbous – More than
half full