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Haumea, Makemake, Eris were never considered regular planets, fixed that.
[[File:Venus and Jupiter 2012.jpg|thumb|280px|Venus and Jupiter conjunction in night sky, March, 2012.]]
[[File:Venus and Jupiter 2012.jpg|thumb|280px|Venus and Jupiter conjunction in night sky, March, 2012.]]
A '''planet''' is an astronomical body that is in [[orbit]] around a [[star]], that has sufficient mass for its own [[gravity]] to overcome rigid body forces, assumes an approximately spherical shape, and has cleared the neighborhood around its orbit,<ref>http://www.iau.org/iau0603.414.0.html</ref> i.e. has "swept out" the area around its orbit during its formation, accreting into its mass all other smaller bodies within its orbit. Consequently, a planet does not share its orbital region with any other bodies of significant size, except for its satellites or those collected later by virtue of its gravitational field.
A '''planet''' is an astronomical body that has sufficient mass for its own [[gravity]] to surpass rigid body forces, assumed an approximately spherical shape, and has cleared the neighborhood around its orbit,<ref>http://www.iau.org/iau0603.414.0.html</ref> i.e. has "swept out" the area around its orbit during its formation, accreting into its mass all other smaller bodies within its orbit. Consequently, a planet does not share its orbital region with any other bodies of significant size, except for its satellites or those collected later by virtue of its gravitational field.
The order of the planets, from the [[Sun]] outward, is:
The order of the planets, from the [[Sun]] outward, is:
#[[Neptune]]
#[[Neptune]]
[[Pluto]] is no longer considered a regular planet; it was reclassified to a [[Dwarf Planet]] by the [[International Astronomical Union|IAU]], along with [[Ceres]], [[Haumea]], [[Makemake]] and [[Eris]].
[[Pluto]] is no longer considered a regular planet; it was reclassified to a [[Dwarf Planet]] by the [[International Astronomical Union|IAU]], along with [[Ceres]]. Other notable Dwarf Planets include [[Haumea]], [[Makemake]] and [[Eris]].
An easy way to remember this order is, "Mary's violet eyes make Johnny stay up nights." [http://www.nineplanets.org/intro.html]
An easy way to remember this order is, "Mary's violet eyes make Johnny stay up nights." [http://www.nineplanets.org/intro.html]