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"New Horizons" makes a flyby of Kuiper belt object 2014 MU, nicknamed Ultima Thule, at 05:33 UTC, becoming the farthest object in the Solar System visited by a spacecraft. It is a contact binary.
2019-01-1

Astronomers announce the discovery of trans-Neptunian object 2018 VG, the most distant object in the Solar System ever observed at a distance of ~120 ul=AU.
2018-12-17

2015 TH (previously known as V774104), a 100–400 kilometer asteroid, is announced as possibly the fourth most distant known Solar System object from the Sun at nearly 90 (±10) times Earth's distance from the Sun.
2018-03-13

Astronomers announce that 2014 UZ224 is the third most distant Solar System object known from our Sun, currently over 90 times the Earth's distance from the Sun (90.8 AU or 8.44 billion miles), after Eris (96.2 AU) and V774104 (~103 AU).
2016-10-11

Astronomers announce the discovery of V774104, the most distant object yet found in the Solar System, a dwarf planet orbiting at three times the distance of Pluto.
2015-11-11

Astronomers announce that the newly discovered double star system WISE 1049-5319 is the third-closest neighbor to the Solar System.
2013-03-11

NASA announces that the "Voyager 1" spacecraft, launched in 1977, has nearly reached the edge of the Solar System and is imminently to past through the heliosphere into interstellar space.
2012-12-3

ESO says Makemake, one of the Solar System’s five dwarf planets, has been found to have no atmosphere.
2012-11-22

Alpha Centauri Bb, an exoplanet, is discovered orbiting around Alpha Centauri, the nearest star system to our Solar System.
2012-10-17

Astronomers discover the first Earth analog extrasolar planet that may be capable of supporting life, Gliese 581 g, located within the habitable zone and orbiting Gliese 581, a red dwarf star twenty light years from the Solar System.
2010-09-29