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Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System. [22] It is a trans-Neptunian object (TNO) in the scattered disk and has a high-eccentricity orbit. Eris was discovered in January 2005 by a Palomar Observatory–based team led by Mike Brown and verified
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
2006 – The 26th General Assembly of the IAU voted in favor of a revised definition of a planet [234] and officially declared Ceres, Pluto, and Eris dwarf planets. [235] [236] 2007 – Dwarf planet Gonggong, a large KBO, was discovered by Megan Schwamb, M. Brown, and D. Rabinowitz. [237] 2008 – The IAU declares Makemake and Haumea dwarf planets.
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.
Earth orbiter; discovered Van Allen radiation belts [5] Vanguard 1: 17 March 1958 ... First Venus lander and the first spacecraft to "soft" land on another planet ...
No vulcanoids, asteroids between the orbit of Mercury and the Sun, have been discovered. [132] [133] As of 2024, one asteroid has been discovered to orbit completely within Venus's orbit, 594913 ꞌAylóꞌchaxnim. [134] Venus-crossing asteroids are those that cross the orbit of Venus. There are 2,809 as of 2015. [135]
In 1992, the first evidence of a planetary system other than our own was discovered, orbiting the pulsar PSR B1257+12. Three years later, 51 Pegasi b, the first extrasolar planet around a Sunlike star, was discovered. NASA announced in March 2022 that the number of discovered exoplanets reached 5,000, of several types and sizes. [45]
New "planets" were discovered every year; ... compared with Mercury, Venus, Earth, Mars, and Pluto. ... The Eris symbol is a traditional one from Discordianism, a ...