Chapter 2 - Why is the sun up sometimes, but not other times?

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Across
  1. 2. a huge object in space that gives off heat and light
  2. 4. an arrangement of stars as seen from Earth
  3. 7. the pull between Earth and other objects, which acts even without touching
Down
  1. 1. something we observe to be similar over and over again
  2. 2. system the sun, the planets that orbit the sun, and other objects that orbit the sun
  3. 3. a scientist who studies stars, planets, and other objects in the universe
  4. 5. the only star in our solar system
  5. 6. a period of time that is 24 hours long and includes daytime and nighttime