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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 ...
2005 – M. Brown, C. Trujillo, and D. Rabinowitz discover Eris, a TNO more massive than Pluto, [229] and later, by other team led by Brown, also its moon, Dysnomia. [230] Eris was first imaged in 2003, and is the most massive object discovered in the Solar System since Neptune's moon Triton in 1846.
Vostok 1 – First crewed Earth orbiter Mariner 2 – First successful Venus flyby Mariner 4 – First successful Mars flyby Luna 9 – First successful lunar lander Zond 5 – First lunar flyby and return to Earth, first terrestrials to circle the Moon Apollo 8 – First crewed lunar orbiter Apollo 11 – First crewed lunar landing
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 1804 Karl Ludwig Harding discovered the asteroid Juno, [94] and in 1807 Olbers discovered the asteroid Vesta. [95] In 1845 Karl Ludwig Hencke discovered a fifth body between Mars and Jupiter, Astraea, [96] and in 1849 Annibale de Gasparis discovers the asteroid Hygiea, the fourth largest asteroid in the Solar System by both volume and mass. [97]
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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]