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

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Across
  1. 2. Earth spins ____ each day. We face the sun in daytime, and we face away from the sun at nighttime.
  2. 5. the pull between Earth and other objects, which acts even without touching
  3. 6. something we observe to be similar over and over again
Down
  1. 1. an arrangement of stars as seen from Earth
  2. 3. a period of time that is 24 hours long and includes daytime and nighttime
  3. 4. Scientists plan investigations to answer their questions. They think about what they will observe and record, as well as what they will change and what they will keep the _____.