The ,
Barcelona soccer jerseysdefinition of planet has comprised many different things. Over the millennia, use of the term was never strict and its meaning has blurred to include or exclude a variety of objects. By the end of the 19th century,
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planet had settled into a comfortable working term. It applied only to objects in the
Solar System; a number small enough that any differences could be dealt with on an individual basis. After 1992 however, astronomers began to discover many additional objects beyond the orbit of
Neptune, as well as hundreds of objects
orbiting other stars. These discoveries not only increased the number of potential planets,
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planet came to a head in 2005 with the discovery of the
trans-Neptunian object Eris, a body larger than the smallest then-accepted planet,
Pluto. In its 2006 response, the
International Astronomical Union released its decision on the matter. This definition,
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Sun, is
massive enough for its
own gravity to make it round,
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cleared its neighbourhood" of smaller objects around its orbit. Under this new definition, Pluto, along with the other trans-Neptunian objects, does not qualify as a planet.