Space Review

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Across
  1. 4. the _______, or terrestrial planets include Mercury, Venus, Earth, and Mars
  2. 6. the color of a star gives you information about its _______________
  3. 8. the __________ theory states that the universe started off at a single point and is expanding
  4. 10. _______ is determined by an object's mass and distance
Down
  1. 1. a star is powered by nuclear ______ in its core
  2. 2. a sudden explosion of energy on the sun
  3. 3. cosmic "snowballs" of frozen gases, dust
  4. 5. ____________ is when the moon is closest to Earth in its orbit
  5. 7. seasons are caused by earth's ______ and orbit
  6. 9. our solar system is part of the Milky Way ______