Think Of Space

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Across
  1. 2. The natural glow of the night sky due to reactions that take place in the Earth's upper atmosphere.
  2. 3. The path one object takes around another.
  3. 4. A shooting star, observed when a particle of dust enters into the Earth's atmosphere.
  4. 6. The bright surface of the Sun.
  5. 10. Way Our Galaxy. (The word "Galaxy" actually means milky way in Greek).
  6. 11. A star which suddenly flares up to many times its original brightness before fading again.
  7. 13. A small object orbiting a larger one.
  8. 14. The distance from the Earth to the Sun. Usually written AU.
  9. 16. A rock, or Minor Planet orbiting the Sun.
  10. 17. A region of space around a very small and extremely massive object within which the gravitational field is so strong that not even light can escape.
  11. 19. The system of planets and other objects orbiting the star Sol, which happens to be our Sun.
  12. 22. The distance which a ray of light would travel in one year.
  13. 24. The compactness of matter.
Down
  1. 1. The smallest particle of any element.
  2. 2. The gaseous area surrounding a planet or other body.
  3. 5. A light in the atmosphere caused by a meteor falling towards the Earth.
  4. 7. An object moving around a star.
  5. 8. When our view of one object in the sky is blocked by either another object or the Earth's shadow.
  6. 9. A grouping of stars which have been given names by ancient astronomers because of the way they look.
  7. 12. Shaped like or forming a ring.
  8. 15. Any small object in Outer Space, such as dust or a rock.
  9. 18. A small, frozen mass of dust and gas revolving around the sun.
  10. 20. An object from Outer Space, such as a rock, that falls into the Earth and lands on its surface.
  11. 21. A group of stars, gas and dust held together by gravity.
  12. 23. Substance which cannot be broken down any further. There are 92 known elements.