25.1 & 25.2 Crossword Pg 790-801

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Across
  1. 3. A low flat plain formed by ancient lunar lave flows.
  2. 7. In this model, Earth is stationary while objects in the sky move around it.
  3. 9. A ___ is a relatively small natural body in space that revolves around a planet.
  4. 10. One _________ unit equals the average distance from Earth to the sun.
  5. 11. This plane of imaginary tabletop containing Earth's orbit.
  6. 12. _____ and inertia combine to keep the planets in orbit around the sun.
  7. 14. Occurs when the shadow of one body in space, such as a planet or moon, falls on another.
  8. 15. The first person to set foot on the moon.
  9. 16. The regular rise and fall of ocean waters.
  10. 17. A space ______ is an unpiloted vehicle that carries scientific instruments into space and transmits information back to earth.
Down
  1. 1. The darkest part of the moon's shadow.
  2. 2. Our solar system consists of the sun, the planets, their moons, and a variety of smaller objects that mostly revolve in the same plane around the ____.
  3. 4. The lack of an _________ allows the moon's surface temperature to vary tremendously.
  4. 5. In this model, Earth and the other planets revolve around the sun.
  5. 6. A round depression in the surface of the moon caused by the impact of high-speed meteoroids.
  6. 8. The different shapes of the moon visible from Earth.
  7. 13. A region of shadow that is less dark than the umbra.