SET 4

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Across
  1. 2. Remnant of an exploded star
  2. 3. Point of infinite density
  3. 6. Celestial object with icy nucleus and tail
  4. 9. Visible surface of the Sun
  5. 11. Person trained to travel in space
  6. 12. Space rock burning in atmosphere
  7. 13. The Sun’s rhythmic energy output
Down
  1. 1. Large planet made mostly of gases
  2. 4. Nearest major galaxy to the Milky Way
  3. 5. Brightest planet visible from Earth
  4. 7. Large-scale structure of the universe
  5. 8. Farthest known planet in our solar system
  6. 10. Planet with most moons
  7. 12. Fourth planet from the Sun
  8. 13. Small body orbiting the Sun, bigger than asteroid