Space

1. An imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates.
4. Dark, flat areas if the moon's surface formed from huge ancient lava flows.
5. A streak of light in the sky produced by the burning of a meoroid in Earth's atmosphere.
9. The tide with the least difference between consecutive low and high tides.
12. An object that orbits a star and is large enough to become rounded by its own gravity.
13. The blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth.
15. The partial or total blocking of one onject in space by another.
17. A system of organizing time that defines the beginning, length, and divisions of a year.
18. A chunk of rock or dust 9n space, generally smaller than an asteroid.
19. The part of a shadow surrounding the darkest part.
20. A pattern or grouping of stars that people imagine to represent a figure or an object.
21. One of the different apperant shapes of the moon as seen from Earth.

2. A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
3. A large round pit caused by the impact of a meteoroid.
6. Either of the two days of the year on whichneither hemisphere is tilted or away from the sun.
7. The path of an object as it revolves aroung another object in space.
8. The scientific law that states that every object in the universe attracts every other object.
10. The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon.
11. An object that orbits a planet
14. A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit.
16. The tide with a buldge in the middle and arms that spiral outward in a pinwheel pattern.