from Voyager 2 measurements of Uranus and Neptune masses,
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1992
Jewitt discovers first recognized Kuiper belt object


2003
Sedna discovered


2006
Pluto demoted to dwarf planet


2012
2012 VP113 discovered


2014
WISE data show no evidence for large planet in outer solar system


2015
New Horizons spacecraft to fly by Pluto


2023
Large Synoptic Survey Telescope to begin operations



Over the next half century, the search for more planets went in and out of vogue. Like a game of solar system Whac-A-Mole, new predictions popped up after each claimed discovery was trounced. The predictions relied on observations of Neptune as well as a handful of comets that reached their farthest point from the sun at nearly the same distance, a clue that a massive planet was bringing the comets all to the same point before the comets returned to the sun.
In the early 1900s,

http://mejora-e-pyme.c...c=21672.msg21752#msg21752

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