Solar System Test Review

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Across
  1. 5. An area on the Sun's surface that has cooled
  2. 7. The largest planet in the solar system.
  3. 8. A transparent layer between the corona and photosphere that is part of the Sun's atmosphere.
  4. 9. Densest layer of the Sun. Heat is produced in waves.
  5. 10. Sun's atmosphere that gives off its reddish glow.
  6. 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.
  7. 16. The first satellite to ever be successfully launched into space.
  8. 17. Part of Sun where gases are heated, rise and then cool and sink.
  9. 20. The only satellite to orbit Earth
  10. 23. First American Woman in space.
  11. 24. The last planet in our solar system
  12. 25. "The Red Planet"
  13. 26. The gas giants are also known as this
  14. 28. First American to orbit around the Earth.
  15. 29. Occurs when sunspot regions connect and release large amounts of electromagnetic energy.
Down
  1. 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. 2. "Hottest planet"
  3. 3. A revolution of 88 Earth days.
  4. 4. Pluto is considered one of these
  5. 6. A large, bright red plasma that extends outward of the Sun's surface.
  6. 11. The only planet known to have liquid water.
  7. 12. Any celestial object that has its own orbit and clears is neighborhood.
  8. 14. Group of planets that are found between the Sun and asteroid belt.
  9. 15. Astronomer who was the first to state that planets revolve around the Sun rather than Earth.
  10. 17. The part of the Sun that can only be seen during a solar eclipse.
  11. 18. The largest object in the asteroid belt.
  12. 19. Planet that has a solid metal core and solid rock surface.
  13. 21. The type of chemical reaction that powers the Sun.
  14. 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.
  15. 27. Inertia and gravity are the two _____ that hold planets in orbit.