Space

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Across
  1. 1. A region of space having a gravitational field so intense that no matter or radiation can escape.
  2. 4. The leading explanation for how the universe began.
  3. 5. The
  4. 11. The shape of the directly sunlit portion of the Moon as viewed from Earth.
  5. 12. The region of interplanetary space between Mars and Jupiter where most asteroids are found.
  6. 14. The curved path of a celestial object around a star, planet, or moon.
  7. 15. The distance light travels in one year (approx. 9.46 trillion km).
Down
  1. 2. The average distance between Earth and the Sun (approx. 93 million miles).
  2. 3. and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun.
  3. 6. One complete orbit of a planet around the sun (defines a "year").
  4. 7. The cloud of gas and dust from which our solar system formed.
  5. 8. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  6. 9. A celestial object consisting of a nucleus of ice and dust that leaves a "tail" when near the sun.
  7. 10. The angle between an object's rotational axis and its orbital axis (causes seasons on Earth).
  8. 13. An event in which the shadow of one celestial body falls on another.
  9. 16. The spinning of a planet on its axis (defines a "day").