Vocab 28.1

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Across
  1. 4. colliding particles in the solar system form this
  2. 6. an overall shape that is centered on two points instead of a single point as in a circle
  3. 7. the backward movement of a planet
Down
  1. 1. earths average distance to the sun is 1.496*10^8km = too
  2. 2. the point where an orbit is closest to the sun
  3. 3. the shape of planets elliptical orbit
  4. 5. the point in a planets orbit at which it is furthest from the sun