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| Term | Definition |
|---|---|
| Satellite | a celestial body orbiting another of larger size |
| Meteor | an atmospheric phenomenon (such as lightning or a snowfall) |
| Asteroid | any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter |
| Comet | a celestial body that appears as a fuzzy head usually surrounding a bright nucleus, that has a usually highly eccentric orbit, that consists primarily of ice and dust, and that often develops one or more long tails when near the sun |
| Meteorite | a meteor that reaches the surface of the earth without being completely vaporized |
| Meteoroid | a meteor particle itself without relation to the phenomena it produces when entering the earth's atmosphere |
| Gravity | the gravitational attraction of the mass of the earth, the moon, or a planet for bodies at or near its surface |
| Telescope | a usually tubular optical instrument for viewing distant objects by means of the refraction of light rays through a lens or the reflection of light rays by a concave mirror |
| Orbit | a path described by one body in its revolution about another (as by the earth about the sun or by an electron about an atomic nucleus) |
| Revolution | a sudden, radical, or complete change |
| Rotation | the action or process of rotating on or as if on an axis or center |
| Axis | a straight line about which a body or a geometric figure rotates or may be supposed to rotate |
| Dwarf planet | a celestial body that orbits the sun and has a spherical shape but is not large enough to disturb other objects from its orbit |
| Tide | the alternate rising and falling of the surface of the ocean and of water bodies (such as gulfs and bays) connected with the ocean that occurs usually twice a day and is the result |
| Equinox | either of the two points on the celestial sphere where the celestial equator intersects the ecliptic |
| Solstice | either of the two points on the ecliptic at which its distance from the celestial equator is greatest and which is reached by the sun each year about June 21 and December 21 |
| Waxing | something likened to wax as soft, impressionable, or readily molded |
| Waning | to decrease in size, extent, or degree |
| Crescent | the moon at any stage between new moon and first quarter and between last quarter and the succeeding new moon when less than half of the illuminated hemisphere is visible |
| Gibbous | marked by convexity or swelling |
| High tide | the tide when the water is at its greatest elevation |
| Low tide | the farthest ebb of the tide |
| Flood tide | a rising tide |
| Ebb tide | the tide while ebbing or at ebb |
| Tidal range | the vertical difference in sea level between high tide and low tide at a specific location |
| Spring tide | a tide of greater-than-average range around the times of new moon and full moon |
| Neap tide | a tide of minimum range occurring at the first and the third quarters of the moon |
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