Solar system and earth

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Across
  1. 2. Without Earth's ______, we would fly right off it.
  2. 3. ______ was the scientist who discovered gravity.
  3. 5. The planet farthest from the sun is ______.
  4. 7. smallest: Mercury::largest:_____
  5. 9. The woolen cap is used in winters when the temperature is _____.
  6. 10. In India, we measure temperature in _______.
  7. 12. What is the in the center of our solar system?
  8. 13. A person who is specially trained to travel to outer space.
  9. 14. The earth completes one _____ of the sun in 24 hours.
Down
  1. 1. A space ______ is a spacecraft that is used to carry astronauts and cargo into space.
  2. 2. The sun is mostly made up of ______.
  3. 4. A _____ is used to measure temperature.
  4. 6. Astronauts have special gear called a ______.
  5. 8. How is the weather today in Delhi?
  6. 11. Which planet takes 365 days to go around the sun?