| − | According to the 2006 definition, a [[planet]] is an object that orbits the sun, is massive enough that its own gravity pulls it into a nearly round shape, and is dominant enough to clear away objects in its vicinity.<ref>http://www.nasa.gov/vision/universe/solarsystem/planetsf-20060824.html</ref> According to that definition, there are eight planets in the solar system. They are, in order of increasing distance from the sun: | + | According to the 2006 definition, a [[planet]] is an object that orbits the sun, is massive enough that its own gravity pulls it into a nearly round shape, and is dominant enough to clear away objects in its vicinity.<ref>https://www.nasa.gov/vision/universe/solarsystem/planetsf-20060824.html</ref> According to that definition, there are eight planets in the solar system. They are, in order of increasing distance from the sun: |