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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 ...
c. 560 BCE – Anaximander is arguably the first to conceive a mechanical model of the world, although highly inaccurate: a cylindrical Earth [11] floats freely in space surrounded by three concentric wheels turning at different distances: the closest for the stars and planets, the second for the Moon and the farthest for the Sun, all conceived ...
The known icy moons in this range are all ellipsoidal (except Proteus), but trans-Neptunian objects up to 450–500 km radius may be quite porous. [10] For simplicity and comparative purposes, the values are manually calculated assuming that the bodies are all spheres. The size of solid bodies does not include an object's atmosphere.
The USSR and the US both launch probes to the Moon, but NASA's Pioneer probes all failed. The Soviet Luna program was more successful. Luna 2 crash-lands on the Moon's surface in September, and Luna 3 returns the first pictures of the Moon's farside in October.
Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io. [1]
Asteroid sample return mission (sample returned 24 September 2023 [needs update]) [459] [460] InSight: 5 May 2018 Mars lander [461] [462] Queqiao: 20 May 2018 Relay satellite for Chang'e 4 in Halo orbit around Earth–Moon L 2 Lagrange point [463] Parker Solar Probe: 12 August 2018 Solar corona probe, closest solar approach (0.04 AU) [464] [465 ...
Here are the 12 full moon dates of 2025, according to the Old Farmer's Almanac full moon calendar. January 13: Wolf Moon. February 12: Snow Moon. March 14: Worm Moon. April 12: Pink Moon. May 12 ...
Download as PDF; Printable version; In other projects Appearance. move to sidebar hide. Discovery of outer planet moons. Graphs are unavailable due to technical ...