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Across 5. Cataclysmic birth of the universe. (3 Words) 8. A bright trail of streak of light that appears in the night sky when a meteoroid enters the earth's atmosphere. 9. A sun centered solar system. (2 Words) 11. The magnitude of a star as it appears to an observer on the earth. (2 Words) 12. The fundamental force of attraction that all objects with mass have for eachother. 14. Having to do with the big bang theory. (2 Words) 15. A group of stars seen as forming a figure or design in the sky. 18. The theory of an earth centered solar system. (2 Words) 20. Hertzsprung-Russell diagram. (2 Words) 22. A large spherical celestial body consisting of a mass of gas that is hot enough to sustain nuclear fusion and thus produce radiant energy. 23. A measure of the amount of matter contained in or constituting a physical body. 24. A meteor that reaches the earth's surface. 25. Any celestial body within the solar system that is larger than a satellite but smaller that a planet, and tha orbits the sun. (2 Words) 26. A bright star at the end of the handle of the little dipper in the constellation Ursa Minor. 27. A shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth. (2 Words) 28. The totality of matter, energy, and space, including the solar system, the galaxies and the contents of space between the galaxies. 29. The sun together with all the planets and other bodies that revolve around it. (2 Words) 30. Any of the numerous small, often irregularly shaped rocky bodies that orbit the sun primarily in the asteroid belt.

Down 1. The force with which an object near the earth or another celestial body is attracted towrad the center of the body by gravity. 2. a visible, thinly spreade cloud of interstellar gas and dust. 3. The magnitude of a star as it would appearto a hypothetical observer at a distance of 10 parsecs or 32.6 light-years. (2 Words) 4. One possible scenario for the ultimalte fate of the universe. (3 Words) 6. Any of the five planets Jupiter, Saturn, Uranus, Neptune, and pluto, whose orbits lie outside that of Mars. (2 Words) 7. A celestial object that orbits the sun along an elongated path. 10. The distance that light travels in a vacuum in one year. (2 Words) 13. Any of the four planets Mercury, Venus, Earth,and Mars, whose orbits lie nearest the sun. (2 Words) 16. A small rocky or metallic body revolving in interplanetary space aroung the sun. 17. The path followed by a celestial body or artificial satellite as it revolves around another body due to the force of gravity 19. A reaction in which two nuclei combine to form a nucleuus with the release of energy. (2 Words) 21. The scientific study of the universe and the objects in it. 22. An object launched to orbit earth or another celestial body.