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1845 – John Adams predicts the existence and location of an eighth planet from irregularities in the orbit of Uranus. [138] 1845 – Karl Ludwig Hencke discovers a fifth body between Mars and Jupiter, Astraea [139] and, shortly thereafter, new objects were found there at an accelerating rate. Counting them among the planets became ...
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 ...
January 1 – Italian astronomer Giuseppe Piazzi makes the first discovery of an asteroid, Ceres, which is briefly considered to be the eighth planet. [1]July 11 – French astronomer Jean-Louis Pons makes the first of his 37 comet discoveries.
From its discovery in 1846 until the discovery of Pluto in 1930, Neptune was the farthest known planet. When Pluto was discovered, it was considered a planet, and Neptune thus became the second-farthest known planet, except for a 20-year period between 1979 and 1999 when Pluto's elliptical orbit brought it closer than Neptune to the Sun, making ...
Former planets of the Solar System Former planet Discovery Removal Current status Notes The Morning Star [NB 1]: Antiquity: Antiquity: Aspects of Venus "Phosphorus", the Morning Star of Greek antiquity (Eosphorus, the Dawn-Bringer; called "Lucifer" by the Romans), and "Hesperus", the Evening Star (called "Vesper" by the Romans), were later identified as a single planet, Venus (Aphrodite).
Alexis Bouvard's native farm in Contamines-Montjoie. Alexis Bouvard (French pronunciation: [alɛksi buvaʁ], 27 June 1767 – 7 June 1843) was a French astronomer. [citation needed] He is particularly noted for his careful observations of the irregularities in the motion of Uranus and his hypothesis of the existence of an eighth planet in the Solar System.
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Planet quest: the epic discovery of alien solar systems. New York: Free Press. ISBN 978-0-684-83252-4. Littmann, Mark (1990). Planets beyond: discovering the outer solar system. The Wiley science editions. New York: Wiley. ISBN 978-0-471-51053-6. Schilling, Govert (2009). The hunt for Planet X: new worlds and the fate of Pluto. New York, NY ...
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