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Across
  1. 3. / a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  2. 4. / the curved path of a celestial object or spacecraft around a star, planet, or moon, esp. a periodic elliptical revolution.
  3. 7. / of the earth refers to the way it revolves around the sun. Combined with the tilt of the earth on its axis, this is what creates the years.
  4. 8. / the action of rotating around an axis or center:Precession / the slow movement of the axis of a spinning body around another axis due to a torque (such as gravitational influence) acting to change the direction of the first axisNutation /
  5. 9. / of the solar system that orbit the sun
  6. 11. 3 Laws / these were laws about the planetary motion
  7. 12. Shift / the displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects.
Down
  1. 1. / a fixed luminous point in the night sky that is a large, remote incandescent body like the sun.
  2. 2. / an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
  3. 5. / of or relating to the center of gravity.
  4. 6. System / the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
  5. 10. Shift /the displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer.