| A | B |
|---|
| stars | spherical masses of hot gases that produce energy |
| planets | solid bodies which move in definite paths around a central star |
| moons | solid objects that orbit the planets |
| asteroids | large, irregular shaped rocks that orbit the Sun |
| comets | masses of ice and embedded rock debris |
| meteoroids | rock fragments in space that can be as big as a boulder or as small as dust |
| Moon phases | the changes in the shape of the moon as seen from Earth |
| tides | the cyclic pattern of water rising and falling along the ocean shoreline |
| rotate | the turning of an object on its axis |
| revolve | the movement of one object around another |
| latitude | the angular distance north and south of the Equator |
| Equator | zero degree line of latitiude, divides the Earth into Northern and Southern Hemispheres |
| longitude | the angular distance east and west of the Prime Meridian |
| Prime Meridian | zero degree line of longitude, it divides the Earth into Eastern and Western Hemispheres |
| Summer solstice | the noon sun is overhead at the Tropic of Cancer (23.5 degrees North) ususally occurs on June 21 |
| Winter solstice | the noon Sun is overhead at the Tropic of Capricorn (23.5 degrees South) usually occurs on December 21 |
| equinox | when the Sun is directly over the equator, 12 hours of day/night occurs worldwide, March 21 and September 21 |
| axis of rotation | imaginary line through an object that the object spins on |
| eclipse | the temporary darkening of the Sun or the Moon |
| orbit | the path of a planet around the sun or a satellite around a planet |
