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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 ...
Since then, the region they occupy between Mars and Jupiter is known as the asteroid belt. 1846 – Urbain Le Verrier predicts the existence and location of an eighth planet from irregularities in the orbit of Uranus. [137] 1846 – Johann Galle discovers the eighth planet, Neptune, following the predicted position gave to him by Le Verrier. [137]
Attempted Mars orbiter/Phobos landers (contact lost) [286] [287] Phobos 2: 12 July 1988 Mars orbiter/attempted Phobos landers (contact lost) [288] [289] Magellan: 4 May 1989 Venus orbiter [290] [291] Galileo: 18 October 1989 Venus flyby, first Asteroid flyby , first Asteroid moon discovery , first Jupiter orbiter, first Jupiter atmospheric probe
In 1966, the Moon became the first Solar System body beyond Earth to be orbited by an artificial satellite , followed by Mars in 1971 , Venus in 1975 , Jupiter in 1995 , the asteroid Eros in 2000 (NEAR Shoemaker), Saturn in 2004 (Cassini–Huygens), and Mercury and Vesta in 2011 (MESSENGER and Dawn respectively).
He found that each of the five Platonic solids could be inscribed and circumscribed by spherical orbs; nesting these solids, each encased in a sphere, within one another would produce six layers, corresponding to the six known planets—Mercury, Venus, Earth, Mars, Jupiter, and Saturn.
Originally formulated by two independent research groups in 1976, the giant impact model supposed that a massive planetary object the size of Mars had collided with Earth early in its history. The impact would have melted Earth's crust, and the other planet's heavy core would have sunk inward and merged with Earth's.
The closest in the past 1,000 years was in 1761, when Mars and Jupiter appeared to the naked eye as a single bright object, according to Giorgini. Looking ahead, the year 2348 will be almost as close.
First animals and plants to leave Earth orbit and travel to and around the Moon. First lunar spacecraft to be recovered successfully. USSR Zond 5 [24] 7 December 1968: First orbital ultraviolet observatory. USA (NASA) OAO-2: 21 December 1968: First human excursion beyond low Earth orbit. First in-person observations of Earth from a distance.