Earth's Place in the Universe

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Across
  1. 3. when objects in the night sky seem to change position due to the Earth's rotation on its axis
  2. 5. the spinning of our planet on its axis
  3. 6. the period of time it takes for earth to make a complete rotation on its axis; 24 hours
  4. 8. the star at the center of the solar system around which Earth and other matter orbit
  5. 9. the daily disappearance of the Sun below the horizon in the west as a result of Earth's rotation
  6. 11. how much energy is coming from the star per square meter per second
  7. 13. the instant at which the upper edge of the sun appears above the horizon in the east
  8. 14. the energy needed to drive photosynthesis
  9. 16. the form of energy that makes it possible to see things
  10. 18. the elliptical orbit of the Earth around the sun
  11. 20. the measured value (always positive) from one point to another
  12. 21. a natural satellite that orbits a planet or smaller body
  13. 22. an area where sunlight cannot reach because it is blocked by an object
  14. 23. the portion of the electromagnetic spectrum that human eyes can detect
Down
  1. 1. the third planet from the sun
  2. 2. the Sun and the celestial objects bound to it by gravity
  3. 4. an obvious regularity in the natural world or in a manmade design
  4. 7. all the matter and energy, including Earth, the galaxies, and the contents of intergalactic space
  5. 8. a massive ball of plasma that shines because of thermonuclear fusion in its core
  6. 10. the intensity of light
  7. 12. the image obtained by plotting dots, bars or lines to show scientific data
  8. 13. occurs twice a year, when the Earth's axis is most oriented toward or away from the sun
  9. 14. one of four major divisions of the year based on the Earth's tilt and the light from the sun
  10. 15. an imaginary line around which Earth rotates
  11. 17. a pattern in the sky formed by stars
  12. 19. the period of darkness between sunset and sunrise