Why don't we see a lot of stars in the daytime?

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Across
  1. 3. something scientists make to answer questions
  2. 6. an arrangement of stars as seen from Earth
  3. 7. to make a picture in your mind using information
  4. 8. the only star in our solar system
Down
  1. 1. a scientist who studies objects in the universe
  2. 2. an attempt to find out about something
  3. 4. system: the sun, the planets that orbit the sun
  4. 5. a period of time that is 24 hours long