an object that orbits a more massive object
(can be natural or man-made)
a satellite in which people can live and work for long periods of time.
Axis of Rotation
earth rotates around an imaginary line running through it's center.
motion of one object around another.
Elipse (Eliptical Orbit)
flattened circle or oval
when sunlight shines equally on the northern and southern hemisphere
when sunlight is at a maximum in one hemisphere and a minimum in the other (December & June)
one celestial body is blocked out by another. shadow makes the sun or moon seem to grow dark- solar or lunar
shadow makes the moon seem to grow dark