B7

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Across
  1. 4. a tendency to do nothing or to remain unchanged.
  2. 5. the star around which the earth orbits
  3. 6. the action of rotating around an axis or center.
  4. 7. a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
  5. 8. strength or energy as an attribute of physical action or movement.
Down
  1. 1. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
  2. 2. the planet on which we live; the world.
  3. 3. System: the collection of eight planets and their moons in orbit around the sun
  4. 5. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
  5. 7. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.