ASTRONOMY

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Across
  1. 2. the largest moon of Saturn
  2. 3. the galaxy that contains our Solar System
  3. 7. time after sunset or before sunrise when the sky is not fully dark
  4. 8. a dwarf planet in the Kuiper belt
  5. 9. something that happens rarely or never
  6. 11. moon’s crescent phase that occurs just after new moon
  7. 15. the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter
  8. 17. a luminous giant star of low or intermediate mass
  9. 19. meteor activity at certain times of the year due to Earth passing through a stream of particles along a comet’s orbit around the Sun
  10. 20. roughly circular feature on the surface of a solar system body caused by the impact of an asteroid or comet
  11. 23. the scientific study of celestial objects and phenomena that originate outside the Earth's atmosphere
  12. 25. bound system of stars, stellar remnants, interstellar gas, dust, and dark matter
  13. 26. star which suddenly flares up to many times its original brightness before fading again
  14. 28. a gas giant with an average radius about nine times that of Earth
  15. 29. brief streak of light caused by a small piece of solid matter entering Earth’s atmosphere at tremendous speed
  16. 31. star ending its life in a huge explosion
  17. 33. the smallest and innermost planet in the Solar System
  18. 35. an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases
  19. 36. brief, sudden brightening of a region of the Sun’s atmosphere
  20. 37. an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite
  21. 39. the smallest of the four Galilean moons orbiting Jupiter
  22. 40. has the longest rotation period
Down
  1. 1. two stars that lie very close to
  2. 4. the distance that light travels in one year
  3. 5. light in the atmosphere caused by a meteor falling
  4. 6. phase of the moon at which the bright side of the Moon is the face turned toward the Earth
  5. 9. a region of space having a gravitational field so intense that no matter or radiation can escape
  6. 10. group of stars that forms an imaginary outline or meaningful pattern on the celestial sphere
  7. 12. the only region in the Sun that produces an appreciable amount of thermal energy through fusion
  8. 13. the explosive event at the beginning of the universe
  9. 14. a giant planet with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined
  10. 16. it is a nearly perfect sphere of hot plasma
  11. 18. an aura of plasma that surrounds the Sun and other stars
  12. 21. rocky, airless worlds that orbit our Sun, but are too small to be called planets
  13. 22. type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity
  14. 24. only astronomical object known to harbor life
  15. 27. temporary dark blemish on the surface of the Sun
  16. 29. has a reddish appearance that is distinctive among the astronomical bodies visible to the naked eye
  17. 30. named after the Roman god of the sea
  18. 32. beautiful lights seen over the polar regions which are caused when energized particles from the Sun react with the Earth’s magnetic field
  19. 34. event that occurs when the shadow of a planet or moon falls upon a second body
  20. 38. an interstellar cloud of dust, hydrogen, helium and other ionized gases