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Across 1. The radiative zone is very dense. It's about 300,000 __________ thick. 4. The sun has been _______ for about 4.6 billion years. 5. These are cool, dark areas in the photosphere of the sun, that have strong magnetic fields. 6. This forms the sun's outer atmosphere. 7. A region about 200,000 km thick where gases circulate. 12. 109 ______ would fit into the sun. 14. The energy passes from the core through a very dense region called the what? 15. The sun's what is 1.989e30 kg. 18. When solar flares erupt, they send huge _______ of electrically charged particles into the solar system. 19. In the center of the sun, the ___________ and pressure are very high. 20. This is at the center of the sun where the sun's energy is produced.

Down 2. The sun's what is 25-36 Earth days. 3. A thin region below the corona, only 30,000 km thick. 8. These are regions of extremely high temperatures and brightness that develop on the sun's surface. 9. The sun is a large ball of gas made of hydrogen and helium held together by this; it's also 99% of the solar system. 10. These are clouds of glowing gas that erupt from the upper chromosphere. 11. The visible part of the sun that we can see. 13. The temperature is 27,000,000 degrees __________. 16. The energy produced in the core takes millions of years to reach the sun's what? 17. What object in space is the sun called besides a sun?