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Dwarf planet

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1 Dwarf planet on Thu Dec 16, 2010 6:21 am

A dwarf planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting the Sun that is massive enough to be spherical as a result of its own gravity but has not cleared its neighbouring region of planetesimals and is not a satellite.[1][2] More explicitly, it has to have sufficient mass to overcome its compressive strength and achieve hydrostatic equilibrium.
The term dwarf planet was adopted in 2006 as part of a three-way categorization of bodies orbiting the Sun,[3] brought about by an increase in discoveries of trans-Neptunian objects that rivaled Pluto in size, and finally precipitated by the discovery of an even more massive object, Eris.[4] This classification states that bodies large enough to have cleared the neighbourhood of their orbit are defined as planets, while those that are not massive enough to be rounded by their own gravity are defined as small solar system bodies. Dwarf planets come in between. The definition officially adopted by the IAU in 2006 has been both praised and criticized, and has been disputed by scientists such as Alan Stern.[5][6]

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2 Re: Dwarf planet on Sun Jan 09, 2011 4:01 am

The First Party System is a model of American politics used by political scientists and historians to periodize the political party system existing in the United States between roughly 1792 and 1824. It featured two national parties competing for control of the presidency, Congress, and the states: the Federalist Party (created by Alexander Hamilton) and dominant to 1800, and the Democratic-Republican Party (created by Thomas Jefferson and James Madison) and dominant after 1800.
The First Party System ended during the Era of Good Feelings (1816–1824), as the Federalists shrank to a few isolated strongholds. In 1824-28, as the Second Party System emerged, the Democratic-Republican Party split into the Jacksonian faction, which became the modern Democratic Party in the 1830s, and the Henry Clay faction, which was absorbed by Clay's Whig Party.

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