The Universe

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Across
  1. 5. The burning of the sun is ____ fusion process
  2. 7. Different views of the moon
  3. 8. Meteoroid that hits the Earth
  4. 11. Produces pulses of very high-energy waves
  5. 12. Extremely accurate clock that measured time at Greenwich
  6. 13. A ___ cluster consists of 100 000 to 1 millions stars located outside the Milky Way
  7. 14. The understanding of the beginning of the world
  8. 16. Mechanical tool for determining latitude
  9. 18. A ____ star is an extremely dense star made up of neutrons packed very close together
  10. 19. A ____ star is made of two stars traveling around each other
  11. 20. Head of a comet
  12. 22. The moon appears larger from new moon to full moon
Down
  1. 1. Another name for the North Star
  2. 2. When a red giant star in unstable, shedding its outer layers
  3. 3. Meteoroid that burns up completely in Earth's atmosphere
  4. 4. A shape of a galaxy
  5. 6. A tool scientists use to break white light into its spectral colours
  6. 9. Total amount of energy a star gives off per second
  7. 10. Small planet-like objects traveling between Mars and Jupiter
  8. 15. When the core of a supergiant star collapses and explodes
  9. 17. The day with 12 hours of day and 12 hours of night
  10. 21. Lump of rock-metal trapped by Earth's gravitational field
  11. 23. A cloud of gases and dust that swirl around in space