Space

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Across
  1. 3. Many of the objects, including planets, travel around the sun.
  2. 6. Orbiting objects made of gas, dust, and ice.
  3. 8. A distance equal to about 150 million km.
  4. 12. There are this many planets in the solar system
  5. 13. The four planets closest to the sun.
  6. 15. Earth completes a full turn in 24 hours.
Down
  1. 1. In 365 days, Earth completes a full journey around the sun.
  2. 2. Structure in space is made of gas in which nuclear fusion reactions occur.
  3. 4. Small rocky objects that orbit the sun.
  4. 5. These are small objects that orbit a larger object.
  5. 7. This is an uncrewed spacecraft sent from Earth to explore objects in space.
  6. 9. This enables astronomers to observe many more stars than they could with their own eyes.
  7. 10. This refers to anything related to the moon.
  8. 11. This is a vehicle designed to propel itself by ejecting exhaust gas from one end.
  9. 14. The four planets farthest from the sun.