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Across 4. to spin, the Earth does this every 24 hours 6. acronym for colors in the visible light spectrum 7. a huge cluster of billions of stars 8. tool used to study the visible light spectrum 12. stating the universe began with a giant explosion of dense material 15. tendency of an object to keep doing what it is already doing until acted on by an outside force 16. when the day and night are equal, happens at the first day of fall and spring 17. portion of the Earths atmosphere that protects us from UV rays 18. small space rocks orbiting the sun, mostly between Mars and Juipiter

Down 1. the joining together, Nuclear fusion provides the suns energy 2. an object made of ice, dust and gas that orbits the sun 3. to orbit an object, the Earth does this around the Sun 5. distance light travels in a year about 6 trillion miles 9. a small group of stars that appear to form a pattern in the sky 10. when the moon blocks the suns light from reaching Earth 11. when the Earth blocks the suns light from reaching the moon 13. the force of attraction between objects 14. the longest and shortest days of the year in terms of daylight