World Space Week

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Across
  1. 1. Force that keeps the planets in orbit
  2. 3. Second name of a Scientist who discovered a comet that is visible from Earth every 75-79 years
  3. 4. U.S. federal government space program (abbreviation)
  4. 7. A person who is trained to travel in a spacecraft
  5. 9. the biggest planet in the solar system
  6. 10. The first man-made satellite to complete a successful orbit of Earth
  7. 11. The closest planet to the centre of the solar system
Down
  1. 2. The name of the first satellite built in India
  2. 4. A cloud of hydrogen gas and cosmic dust in space
  3. 5. The star closest to the Earth
  4. 6. The last words of the Mars Rover: "My battery is getting low and it is getting ________"
  5. 8. The _____________ belt separates the inner planets from the outer planets