Across
- 5. An area on the Sun's surface that has cooled
- 7. The largest planet in the solar system.
- 8. A transparent layer between the corona and photosphere that is part of the Sun's atmosphere.
- 9. Densest layer of the Sun. Heat is produced in waves.
- 10. Sun's atmosphere that gives off its reddish glow.
- 13. The outside layer of a planet that is above its surface. Mercury and the Moon do not have one. Venus has a thick one that contains carbon dioxide.
- 16. The first satellite to ever be successfully launched into space.
- 17. Part of Sun where gases are heated, rise and then cool and sink.
- 20. The only satellite to orbit Earth
- 23. First American Woman in space.
- 24. The last planet in our solar system
- 25. "The Red Planet"
- 26. The gas giants are also known as this
- 28. First American to orbit around the Earth.
- 29. Occurs when sunspot regions connect and release large amounts of electromagnetic energy.
Down
- 1. Twin missions that have been in space for over 45 year and gave scientists their first glimpses to the outer planets and beyond our solar system.
- 2. "Hottest planet"
- 3. A revolution of 88 Earth days.
- 4. Pluto is considered one of these
- 6. A large, bright red plasma that extends outward of the Sun's surface.
- 11. The only planet known to have liquid water.
- 12. Any celestial object that has its own orbit and clears is neighborhood.
- 14. Group of planets that are found between the Sun and asteroid belt.
- 15. Astronomer who was the first to state that planets revolve around the Sun rather than Earth.
- 17. The part of the Sun that can only be seen during a solar eclipse.
- 18. The largest object in the asteroid belt.
- 19. Planet that has a solid metal core and solid rock surface.
- 21. The type of chemical reaction that powers the Sun.
- 22. A celestial object that orbits around the Sun, is made of rock, dust and ice. When heated it glows and gives off two tails.
- 27. Inertia and gravity are the two _____ that hold planets in orbit.