Stars

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Across
  1. 2. spacecraft
  2. 4. a large spacecraft in orbit around Earth
  3. 6. United States astronomer who discovered that (as the universe expands) the speed with which nebulae recede increases with their distance from the observer
  4. 11. cosmic body of extremely intense gravity from which even light cannot escape
  5. 15. amount of matter or substance that makes up an object
  6. 16. a constellation in the N hemisphere lying between Cassiopeia and Pegasus, the three brightest stars being of the second magnitude
  7. 18. an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars
  8. 19. Rigil Kentaurus
  9. 20. a natural luminous body visible in the sky especially at night.
  10. 21. the universal force of attraction acting between all matter
  11. 22. groups of stars that together form recognisable patterns
Down
  1. 1. a doughnut-shaped region of icy bodies extending far beyond the orbit of Neptune
  2. 3. was the first spacecraft to cross the heliosphere
  3. 5. 1.5 hours
  4. 7. the distance light travels in one year
  5. 8. a large spiral system consisting of several hundred billion stars, one of which is the Sun
  6. 9. moons, ring systems, gas clouds, and magnetospheres
  7. 10. an object in space that orbits or circles around a bigger object
  8. 12. a nonmetallic gaseous chemical element with atomic number 1
  9. 13. a property of matter by which it remains at rest or in unchanging motion unless acted on by some external force.
  10. 14. the polestar or North Star, a star of the second magnitude situated close to the north pole of the heavens, in the constellation Ursa Minor
  11. 17. Geology
  12. 21. a huge collection of gas, dust, and billions of stars and their solar systems