Christina is making a model that compares comets and planets which comparison could be part of the model comments and planets have similar orbital time periods, it's in plans revolve around the sun, some planets have similar sizes, it's implants are compared of the same
materials, some comets have similar shapes, comets have tails made of gas and dust, planets have orbits that are nearly circular, comets can have highly elliptical orbits, planets have multiple moons, comets have tails that point away from the sun, planets have atmospheres, comets originate from the Kuiper Belt or Oort Cloud, planets have different compositions, comets can have periods of activity when they pass close to the sun, planets have defined surfaces, comets can have highly eccentric orbits, planets have a gravitational influence on other celestial bodies, comets can have periodic or non-periodic orbits.
