5th Grade
1. Asteroid—a large piece of space rock with an irregular shape.
2. Comet—a space object made up of dust and ice.
3. Dwarf planet—a round space object that is smaller than a planet, is not a moon, and revolves around a star along with other similar space objects.
4. Elliptical—like a flattened circle or oval.
5. Gravity—a force of attraction between two objects.
6. Horizon—the line where the Earth appears to meet the sky
7. Meteoroid—A rocky body with an irregular shape that is smaller than an asteroid.
8. Moon—a natural object that moves in a path around a planet.
9. Orbit—a path around a star or planet.
10. Planet—a large, round object that revolves around a star.
11. Revolve—to move in a fixed path around another object.
12. Rotate—to spin on an axis
13. Solar system—the sun, Earth, all the other planets, and all the objects that travel around the sun.
14. Star—a giant sphere of gases that produces light and heat.
15. Telescope—a tool that makes objects that are very far away appear much closer.
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