science

7. The movement of one object around another along an orbital path.
8. Solstice: The day with the longest period of daylight during the year.
10. The blocking of light from one celestial body as another passes between it and the viewer.
11. The spinning of a planet or object around its own central axis.
12. Tide: An unusually high and low tide occurring around the time of a new or full moon.
13. The third planet from the Sun and the only known world to support life.
16. The curved shape of the Moon when it is less than half illuminated.

1. Unmanned spacecraft designed to explore and gather information about space.
2. The phase of the Moon when it is more than half illuminated but not fully round.
3. Either of the two times a year when the Sun reaches its highest or lowest point in the sky at noon.
4. Eclipse: The darkening of the Moon when it passes directly into Earth's shadow.
5. The invisible force that pulls objects toward one another.
6. Relating to or resembling the Moon.
9. Solstice: The day with the shortest period of daylight during the year.
12. Eclipse: The blocking of sunlight from reaching Earth when the Moon passes directly between the Sun and Earth.
14. The regular rise and fall of ocean water levels caused by gravitational forces.
15. Tide: A moderate tide with the least difference between high and low water, occurring during quarter moons.