The Solar System

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Across
  1. 4. The solar system is located in the outer spiral arm of the ____________ galaxy.
  2. 6. the four Outer Planet are the four farthest planets fom the sun and are also known as what?
  3. 8. an ice giant whose atmosphere consists of hydrogen and helium, some methane, and small amounts of ammonia and water.
  4. 9. the largest planet.
  5. 11. the only planet able maintain sustainable life.
  6. 13. Our ______________ consists of the sun, planets and their moons, and a variety of smaller celestial objects including asteroids, meteors, comets, and many more.
  7. 14. More massive objects have ___________ gravitational pull than less massive ones.
  8. 17. the hottest planet
  9. 19. a regular, repeating path that one object in space takes around another one.
  10. 21. the four Inner planets are the four closest planets to the sun and are also known as what?
  11. 22. a ring of icy bodies located beyondvNeptune where Pluto was discovered.
  12. 23. the only planet that has rings made up of billions of chunks of ice and rock — from tiny, dust-sized grains to a few particles as large as mountains.
Down
  1. 1. the approximate distance between Earth and the sun. An AU is approximately 93 million miles (150 million km).
  2. 2. the smallest planet in our solar system.
  3. 3. a huge collection of gas, dust, and billions of stars which is held together by gravity.
  4. 5. the __________ two objects are from each other, the weaker is the force of gravity between them.
  5. 7. a large celestial body that revolves around a star.
  6. 10. a planet also spins on its own axis. This movement is known as ___________.
  7. 12. the stream of charged particles released from the upper atmosphere of the sun.
  8. 14. force of attraction between objects that have mass.
  9. 15. a region in the solar system that is occupied by many irregularly shaped, solid bodies known as asteroids.
  10. 16. also known as the Red Planet due to its bloody brick-red colored surface mainly because of the presence of iron oxide on rocks.
  11. 18. Planets and moons are examples of natural ____________.
  12. 20. an ice giant and the furthest planet from the sun?