Earth's Place in the Universe

2. large gaseous body at the center of solar system.
8. movement of an object around another object in space.
10. contracting cloud of gas and dust that forms a star.
16. year, the distance that light travels in one year.
17. a pattern or grouping of stars that people imagine to represent an object.
19. the attractive force between objects.
21. a streak of light in the sky produced by burning of meteoroids.
22. a large cloud of gas and dust in space.
25. partial or total blocking of one object in space by another.
26. one of the different apparent shapes of the moon as seen from Earth.
27. loose collection of ice and dust that orbits the sun.
28. system, system consisting of the sun and the planets and other objects that revolve around it.
29. an optical instrument that forms enlarged images of distant objects.
31. one of the rocky objects revolving around the sun that is too small to be a planet.

1. spinning motion of a planet on its axis.
2. the brillant explosion of a dying supergiant
3. a ball of hot gas mainly hydrogen and helium.
4. dwarf, the bluewhite hot core of a star that is left behind after its outer layers expanded.
5. imaginary line that passes through a planet's center.
6. object that orbits a planet.
7. brightness, the brightness of a star as seen from Earth
9. equal parts nights and daytime
11. brightness, the brightness of a star we would see if we were at a standard distance from Earth
12. the periodic rise and fall of the ocean water levels.
13. an object that orbits a star, rounded by own gravity.
14. bang, the initial explosion that resulted in formation of universe.
15. the distance between two corresponding parts of a wave.
18. the range of wavelengths of electromagnetic waves.
20. path of an object as it revolves around another object.
23. all of the space and everything in it.
24. light, electromagnetic radiation that can be seen with the unaided eye.
30. an oval shape.