Space

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Across
  1. 4. A mass that follows an elliptical orbit around a star
  2. 5. A force that attracts the centre of a mass to another
  3. 7. The area around our Earth that we can see considering the speed of light in relation to time since the Big Bang (2 words with underscore
  4. 11. The path a mass follows around another
  5. 13. The red planet
  6. 15. An instrument that magnifies the view of celestial bodies
  7. 16. largest planet in the solar system
  8. 18. A mass of gas that generates heat and light
Down
  1. 1. A system of stars and solar systems that orbit a central mass
  2. 2. A spacecraft designed to orbit a planet or moon or other celestial bodies
  3. 3. A spacecraft designed to land on the surface of a celestial body
  4. 6. A natural satellite that orbits a planet
  5. 8. A system of planets orbiting a star (two words with underscore)
  6. 9. The standard unit of force
  7. 10. A body in orbit around a planet or moon
  8. 12. Our Moon (two words with underscore)
  9. 14. A very large cloud of dust and gas that exists in outer space
  10. 17. Used to be a planet