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Across 3. trapping of heat in the atmosphere 5. thin disk of small particles of ice and rock 6. region of very tightly packed gas where energy is transferred mainly in the form of electromagnetic radiation 12. spherical region of comets 16. doughnut-shaped region where some comets come from 17. outermost layer of the sun's atmosphere 18. fuzzy outer layer of a comet 19. outermost layer of the suns interior 22. inner layer of the sun's atmosphere 23. meteoride that passes through Earth's atmosphere and hit Earth's surface 24. streak of light produced by a burning meteorite in Earth's atmosphere 25. solid inner core of a comet

Down 1. rocky objects revolving around the sun that are to small to be considered planets 2. Mercury, Venus, Eartg, Mars 4. sun's central region 7. 2 aomic nuclei combine, forming a larger more massive nucleas with more energy 8. chunk or rock or dust in space 9. reddish loops of gas that often link sunspots together 10. erruptions of gas on the suns surface 11. streams of electrically charged particles 13. Jupiter, Saturn, Uranus, Neptune (maybe pluto) 14. region of the solar system where asteriods come from 15. middle layer of the sun's atmosphere 20. areas of gas on the sun's surface that are cooler than the gas around them 21. "dirty snowball"