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5. the partially shaded outer region of the shadow cast by an opaque object.
6. dark,flat area on the moon's surface formed from huge ancient lava flows.
8. a distinct period or stage in a process of change or forming part of something's development.
9. an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
10. a asteroid
12. an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.
15. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure. Modern astronomers divide the sky into eighty-eight constellations with defined boundaries.
18. a large, bowl-shaped cavity in the ground or on the surface of a planet or the moon, typically one caused by an explosion or the impact of a meteorite or other celestial body.
19. a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
20. an imaginary line about which a body rotates.
22. a forcible overthrow of a government or social order in favor of a new system.
23. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

1. Newton's law of universal gravitation states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
2. the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
3. The tide with the least difference between consecutive low and high tides.
4. the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun
7. a chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information.
9. The tide with the greatest difference between consecutive low and high tides.
11. an eclipse in which the sun is obscured by the moon.
13. celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the
14. a celestial body moving in an elliptical orbit around a star.
16. an eclipse in which the moon appears darkened as it passes into the earth's shadow.
17. a fixed luminous point in the night sky that is a large, remote incandescent body like the sun.
21. the action of rotating around an axis or center.