What is 90377 Sedna?
[[file:Sedna PRC2004-14d.jpg|thumb|Photograph of Sedna by the [[Hubble Space Telescope]]]][[File:Artist's_conception_of_Sedna.jpg|thumb|right|What 90377 Sedna may look like.]] [[File:Oort cloud Sedna orbit.svg|thumb|right|Image showing 90377 Sedna's Orbit. Moving clockwise from upper left, the images are of: The orbits of [[Inner Planets]] including [[Asteroid Belt]] and [[Jupiter]]; The Solar System showing the Solar System known before 90377 Sedna was discovered with 90377 Sedna well outside orbits of [[Neptune]] and [[Pluto]] and even outside [[Kuiper Belt]]; The full orbit of Sedna; and the inner part of [[Oort cloud]], showing that even this large, elliptical orbit is much closer than the Oort Cloud. ]] '''90377 Sedna''' (or simply '''Sedna'''; symbol [[File:Sedna symbol (bold).svg|16px|⯲]])<ref>U+2BF2 ⯲. David Faulks (2016) 'Eris and Sedna Symbols,' [https://www.unicode.org/L2/L2016/16173r-eris-sedna.pdf L2/16-173R,] Unicode Technical Committee Document Register.</ref> is a [[trans-Neptunian object]] which is the farthest [[dwarf planet]] from the [[Sun]]. It was discovered on November 14, 2003<ref name=cox>{{cite book|title=Wonders of the Solar System|last1=Cox|last2=Cohen|first1=Brian|first2=Andrew|publisher=HarperCollins|date=2010|page=26-27|isbn=9780007386901}}</ref> by [[Mike Brown]], [[Chad Trujillo]] and [[David Rabinowitz]].<ref name=brown>{{cite web|title=Sedna|first=Mike|last=Brown|publisher=Caltech|access-date=2011-07-11|url=http://www.gps.caltech.edu/~mbrown/sedna/}}</ref><ref name=NASA1>{{cite web|title=Planet-Like Body Discovered at Fringes of Our Solar System|url=http://www.nasa.gov/vision/universe/solarsystem/planet_like_body.html|publisher=NASA|first=Whitney|last=Clavin|date=2004-03-15|access-date=2011-07-11|archive-date=2007-11-30|archive-url=https://web.archive.org/web/20071130032242/http://www.nasa.gov/vision/universe/solarsystem/planet_like_body.html|url-status=dead}}</ref> Around 1250-1800 [[km]] in [[diameter]],<ref name=brown /> Sedna takes roughly 11,400 [[year]]s to [[orbit]] the