| Term | Definition |
|---|
| Altitude | Height of an object in the sky above the horizon |
| Aphelion | Point in a planet's orbit where it is farthest from the sun |
| Apogee | Point farthest away from earth in the moon's orbit |
| Apollo 11 | 1969, Neil Armstrong and Buzz Aldrin became first people to walk on the moon |
| Axis | An imaginary line through earth's north and south poles at a tilt of 23.5 degrees |
| Crater | Depression on the surface of a moon or planet usually created by impacts |
| Fall equinox | First day of fall in the northern hemisphere, equal hours of daylight and darkness |
| Geocentric Universe | Universe model with earth at its center |
| Heliocentric Solar System | Universe model with the sun at the center |
| Horizon | Line where the sky and earth seem to meet |
| Lunar eclipse | An eclipse that occurs when the moon passes into earth's shadow |
| Maria | Latin for "seas". Extensive dark areas that represent great basins on the moon |
| Orbit | The paths of objects traveling aroud the sun |
Combine with other sets
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