planets

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Across
  1. 3. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun
  2. 6. a moon, planet or machine that orbits a planet or star
  3. 7. the force that attracts a body toward the center of the earth, or toward any other physical body having mass
  4. 8. the object's orbital motion around another object
Down
  1. 1. an object's spinning motion about its own axis
  2. 2. an invisible line around which an object rotates, or spins
  3. 4. any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources
  4. 5. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution