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Artist's visualization of Sedna

Sedna is a trans-Neptunian object with the minor planet number 90377. It was discovered on November 14, 2003, by three astronomers: Michael Brown, Chad Trujillo, and David Rabinowitz. Sedna is currently 84 astronomical units (AU) from the Sun, which is almost three times the distance between Neptune and the Sun. Sedna's orbit is an ellipse and its aphelion is approximately 937 AU (140 billion km). For most of its orbital period, Sedna is farther from the Sun than any known dwarf planet candidate of its size. Sedna is one of the reddest objects in the Solar System. It is mostly composed of water, methane, and nitrogen ices with tholins. It may have formed within the same open cluster where the Sun was born as some astronomers suggest that Sedna is a celestial body captured by the Sun from another star system. Michael Brown considers it the most important trans-Neptunian object ever discovered, because its unusual orbit may yield information about the origin and early evolution of the Solar System. (Full article...)

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 {{Main page image/TFA|Artist's conception of Sedna.jpg|caption=Artist's visualization of Sedna<!-- conform with mos:capfrag -->}}
-'''[[90377 Sedna|Sedna]]''' is a [[trans-Neptunian object]] with the [[Minor-planet designation|minor planet number]] 90377<!-- bold in blurbs generally only used for links to featured article or topic -->. It was discovered on November 14, 2003, by three [[astronomer]]s:<!-- reworded to conform with mos:seaofblue --> [[Michael E. Brown |Michael Brown]], [[Chad Trujillo]], and [[David L. Rabinowitz|David Rabinowitz]]. Sedna is currently 84<!-- conform with article lead and body --> [[astronomical unit]]s (AU) from the [[Sun]], which is almost<!-- added "almost" to be more accurate --> three times the distance between [[Neptune]] and the Sun. Sedna's [[orbit]] is an [[ellipse]] and its [[Apsis#Perihelion and aphelion|aphelion]] is approximately 937&nbsp;AU (140&nbsp;[[1,000,000,000|billion]]&nbsp;km). For most of its orbital period, Sedna is farther from the Sun than any known [[List of possible dwarf planets|dwarf planet candidate]] of its size. Sedna is one of the reddest objects in the [[S<!-- conform with capitalization used later in the blurb and in linked article -->olar System]]<!-- an earlier instance in the article lead was linked -->. It is mostly composed of [[water]], [[methane]], and [[nitrogen]] ices with [[tholin]]s<!-- reworded to conform with article lead (note: both the lead and body use the plural forms) -->. It may have formed within the same [[open cluster]] where the Sun was born as some astronomers suggest that Sedna is a celestial body captured by the Sun from another star system. Michael Brown considers it the most important trans-Neptunian object ever discovered, because its unusual orbit may yield information about the origin and early evolution of the Solar System. {{TFAFULL|90377 Sedna}}
+'''[[90377 Sedna|Sedna]]''' is a [[trans-Neptunian object]] with the [[Minor-planet designation|minor planet number]] 90377<!-- bold in blurbs generally only used for links to featured article or topic -->. It was discovered on November 14, 2003, by three [[astronomer]]s:<!-- reworded to conform with mos:seaofblue --> [[Michael E. Brown |Michael Brown]], [[Chad Trujillo]], and [[David L. Rabinowitz|David Rabinowitz]]. Sedna is currently 84<!-- conform with article lead and body --> [[astronomical unit]]s (AU) from the [[Sun]], which is almost<!-- added "almost" to be more accurate --> three times the distance between [[Neptune]] and the Sun. Sedna's [[orbit]] is an [[ellipse]] and its [[Apsis#Perihelion and aphelion|aphelion]] is approximately 937&nbsp;AU (140&nbsp;billion&nbsp;km). For most of its orbital period, Sedna is farther from the Sun than any known [[List of possible dwarf planets|dwarf planet candidate]] of its size. Sedna is one of the reddest objects in the [[S<!-- conform with capitalization used later in the blurb and in linked article -->olar System]]<!-- an earlier instance in the article lead was linked -->. It is mostly composed of [[water]], [[methane]], and [[nitrogen]] ices with [[tholin]]s<!-- reworded to conform with article lead (note: both the lead and body use the plural forms) -->. It may have formed within the same [[open cluster]] where the Sun was born as some astronomers suggest that Sedna is a celestial body captured by the Sun from another star system. Michael Brown considers it the most important trans-Neptunian object ever discovered, because its unusual orbit may yield information about the origin and early evolution of the Solar System. {{TFAFULL|90377 Sedna}}
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