Earth and Space Crossword Puzzle

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Across
  1. 3. A white dwarf that has cooled so it no longer emits dangerous amount of heat or light.
  2. 4. A collapsed core of a giant star which before collapse. They are the smallest and densest of stars, stage 5.
  3. 5. A system of stars, stellar remnants, interstellar gas, dust, and dark matter that is bound by gravity.
  4. 6. An icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases.
  5. 9. This occurs when the Sun, Moon and Earth are aligned. The Moon casts a shadow that partially blocks sunlight.
  6. 12. The biggest of the two gas planets.
  7. 13. A fragment of rock or iron from outer space, can be small or big.
Down
  1. 1. The most famous of the astronomical phenomena called polar lights.
  2. 2. A star after they have exhausted their nuclear fuel, stage 9.
  3. 3. The theory that we believe created the universe and everything in it.
  4. 7. The system that our planet, with many others reside in.
  5. 8. The smaller of the two gas planets
  6. 10. The distance that light travels in one year, a unit of "measurement".
  7. 11. A planet close to earth named after the Roman goddess of love and beauty.