Pluto loosing the “9th Planet” title in 2006 was a big controversy for all of us who learned it to be one.
Yet, with more and more discoveries in the universe, it is now re-named a dwarf planet.
Here are the differences.
|A celestial body that(a) orbits around the sun(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a nearly round shape and(c) has cleared the neighborhood around its orbit.||A celestial body that(a) orbits around the sun(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a nearly round shape and(c) has not cleared the neighborhood around its orbit (not cruising alone)(d) is not a satellite.|
|Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune||Ceres, Pluto, Haumea, Makemake, Eris.|
Quick facts about these Dwarf planets
Ceres. Orbits the sin in the asteroid belt region between Mars and Jupiter
Pluto. Discovered as a planet in 1930 and changed to Dwarf planet in 2006. The new horizon spacecraft has been sent to Pluto and will reach it in 2015.
Haumea. It has an odd shape, it is twice as long as wide. Takes 285 years to go around the sun. Discovered in 2004 and accepted in 2008.
Makemake. Discovered in in 2005 accepted in 2008. Takes 310 years to go around the sun. Mostly frozen methane, highly reflective surface, like that of Pluto.
Eris. Largest Dwarf planet. Discovered in 2003. Most distant object to orbit around the sun. 560 years to go around the sun (more than twice of Pluto).
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