space exploration

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Across
  1. 3. detects radio waves from space
  2. 6. the Sun
  3. 7. astronomer, economist
  4. 10. Malaysian satellites
  5. 11. modified the heliocentric model
  6. 14. model with Sun at the center and circular orbits
  7. 15. a geographer
Down
  1. 1. deliver satellites to space
  2. 2. first human to set foot on the moon
  3. 4. model with Earth at the center and circular orbit
  4. 5. Malaysian's first microsatellite
  5. 8. spacecraft that gathers information and send back to Earth
  6. 9. first satellitete
  7. 12. move or cause to move in a circle round an axis or centre
  8. 13. measure the altitude of stars