Inner Solar System

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Across
  1. 4. hottest planet, but it is not closest to the sun
  2. 5. this profession, or job, discovered a new planet that they believe one day might be able to support life
  3. 7. made of ice and rock
  4. 10. the effect of gravity is similar to this playground game
  5. 11. keeps the planets pulling towards the sun, prevents them from floating away
  6. 12. when building a model or looking at a model of our solar system, planets look ______ compared to the sun
  7. 13. located in the center of our solar system
  8. 14. has the thinnest atmosphere of the inner planets, closest to the sun
Down
  1. 1. Mercury, Earth, Venus, and Mars are the four planets closest to the sun. They are called ______ _______.
  2. 2. body of matter, travels around the sun. Our solar system has eight
  3. 3. this planet has two moons, and forms rust on the surface, due to iron-rich materials
  4. 6. system of eight planets, sun, moon, asteroids, and comets
  5. 8. the curved path around a star, planet, or moon
  6. 9. true or false: planets orbit the sun, and moons orbit planets