Space Review

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Across
  1. 4. A date when day and night are approximately equal in length
  2. 5. Earth’s daily spinning motion on its axis
  3. 11. Earth’s yearly motion around the Sun
  4. 12. A huge group of stars, gas, and dust held together by gravity.
  5. 13. A tide with the greatest tidal range, occurring at new and full Moon
  6. 15. The beginning of summer or winter, when daylight is longest or shortest
  7. 16. The point in Earth’s orbit closest to the Sun
  8. 17. A measure of how stretched or elliptical an orbit is
Down
  1. 1. The point in Earth’s orbit farthest from the Sun
  2. 2. The process that produces energy in the Sun and other stars
  3. 3. Term for the large, low-density outer planets
  4. 6. A tide with the smallest tidal range, occurring at quarter Moon phases
  5. 7. Theory stating that the universe began in a hot, dense state and has expanded
  6. 8. The effect that causes winds and currents to curve because Earth rotates
  7. 9. The spiral galaxy that contains our solar system
  8. 10. An event in which one celestial object blocks another or enters its shadow
  9. 14. Incoming solar radiation received at Earth’s surface