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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 ...
1846 – Johann Galle discovers the eighth planet, Neptune, following the predicted position gave to him by Le Verrier. [134] 1846 – William Lassell discovers Neptune's moon Triton, just seventeen days later of planet's discovery. [137] 1848 – Lassell, William Cranch Bond and George Phillips Bond discover Saturn's moon Hyperion. [138] [139]
Its orbit revealed that it was a new planet, Uranus, the first ever discovered telescopically. [20] Giuseppe Piazzi discovered Ceres in 1801, a small world between Mars and Jupiter. It was considered another planet, but after subsequent discoveries of other small worlds in the same region, it and the others were eventually reclassified as ...
Eris (38.3–97.5 AU) is the largest known scattered disc object and the most massive known dwarf planet. Eris's discovery contributed to a debate about the definition of a planet because it is 25% more massive than Pluto [221] and about the same diameter. It has one known moon, Dysnomia. Like Pluto, its orbit is highly eccentric, with a ...
Pioneer 5: 11 March 1960 Interplanetary space investigations [15] [16] Venera 1: 12 February 1961 First probe to another planet; Venus flyby (contact lost before flyby) [17] [18] [19] Vostok 1: 12 April 1961 First crewed Earth orbiter (Yuri Gagarin) [20] [21] Ranger 1: 23 August 1961 Attempted lunar test flight (failed to leave Earth orbit) [22 ...
There are eight planets within the Solar System; planets outside of the solar system are also known as exoplanets. Artist's concept of the potentially habitable exoplanet Kepler-186f As of 6 March 2025, there are 5,849 confirmed exoplanets in 4,367 planetary systems , with 981 systems having more than one planet . [ 1 ]
The Hubble Space Telescope, the first large optical telescope in orbit, is launched using the Space Shuttle, but astronomers soon discovered that it is crippled by a problem with its mirror. A complex repair mission in 1993 allows the telescope to start producing spectacular images of distant stars, nebulae, and galaxies.
First space walk/extra-vehicular activity (Alexei Leonov). USSR Voskhod 2: March 1965: First crewed spacecraft to change orbit. USA (NASA) Gemini 3: 14 July 1965: First flyby of Mars (returned pictures). USA (NASA) Mariner 4 [18] 14 July 1965: First photographs of another planet from deep space . USA (NASA) Mariner 4 [18] 26 November 1965