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Eris was discovered in January 2005 by a Palomar Observatory–based team led by Mike Brown and verified later that year. It was named in September 2006 after the Greco–Roman goddess of strife and discord. Eris is the ninth-most massive known object orbiting the Sun and the sixteenth-most massive overall in the Solar System (counting moons).
Eris is generally assumed to be a dwarf planet because it is more massive than Pluto. In order of discovery, these three bodies are: Ceres – discovered January 1, 1801, and announced January 24, 45 years before Neptune. Considered a planet for half a century before reclassification as an asteroid.
Dwarf planet Eris, similar in size to its better-known cosmic cousin Pluto, has remained an enigma since being discovered in 2005 lurking in the solar system's far reaches. While Pluto was ...
One Plutonian year corresponds to 247.94 Earth years; [3] thus, ... the astronomer who discovered Eris. ... compared to Eris's approximate diameter of 2,326 km. ...
Last year, astronomers discovered an Earth-like planet orbiting Proxima Centauri, the next closest star to our own solar system, which rests about four light-years away.
Other people also confuse Nibiru with Sedna (90377 Sedna) or Eris (136199 Eris), trans-Neptunian objects discovered by Mike Brown in 2003 and 2005 respectively. [82] [83] However, despite having been described as a "tenth planet" in an early NASA press release, [84] Eris (then known only as 2003 UB 313) is now classified as a dwarf planet.
Two teams of scientists have discovered a theoretically habitable planet called Gliese 12b that’s smaller than Earth but bigger than Venus, just 40 light-years away.
For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 km with a density of 0.5 g/cm 3, its true mass would be only 1.12 × 10 19 kg.