Changes

==Planets==

==Planets==

A [[planet]] is defined as 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>  There are eight planets in the solar system. They are, in order of increasing distance from the sun:{{fact}}

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:

*[[Mercury]]

*[[Mercury]]

*[[Venus]]

*[[Venus]]

*[[Neptune]]

*[[Neptune]]

The first four planets are [[terrestrial planet]]s, the last four planets are Jovian planets.  Terrestrial planets are small in size, have high densities, and consist of rocky materials. Jovian planets are large in size, have low densities, and consist of gaseous materials. In some cases, Uranus and Neptune are known as ice giants due to the large presence of gases heavier than hydrogen and helium.  

The first four planets are [[terrestrial planet]]s, the last four planets are Jovian planets.  Terrestrial planets are small in size, have high densities, and consist of rocky materials. Jovian planets are large in size, have low densities, and consist of gaseous materials. In some cases, Uranus and Neptune are known as ice giants due to the large presence of gases they have, heavier than hydrogen and helium.

 

Since 2016, a ninth planet or even several trans-Neptunian planets are being considered likely.

==Dwarf planets==

==Dwarf planets==