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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 ...
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 ...
Sputnik 1: 4 October 1957 First Earth orbiter [1] [2] Sputnik 2: 3 November 1957 Earth orbiter, first animal in orbit, a dog named Laika [2] [3] [4] Explorer 1: 1 February 1958 Earth orbiter; discovered Van Allen radiation belts [5] Vanguard 1: 17 March 1958 Earth orbiter; oldest spacecraft still in Earth orbit [6] Luna 1: 2 January 1959
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 ...
First super-Earth discovered [NB 2] PSR B1257+12 B PSR B1257+12 C: PSR B1257+12: 1992 First planets discovered. [41] First hot Jupiter: 51 Pegasi b: 51 Pegasi: 1995 First planet discovered orbiting a main sequence star. First evaporating planet discovered HD 209458 b: HD 209458: 1999 First transiting planet. [41] First "free-floating" planet ...
A Belgian-led team made the discovery using both space- and ground-based telescopes, spotting the planets as they passed in front of the red dwarf star known as TRAPPIST-1.
Planet type Circumbinary planet: Planet orbits a single star in a multiple star system Planet has a circumbinary orbit in a system with more than 2 stars Planet discovered by Kepler community Potentially habitable None of the above
The newly discovered sub-Neptunes range from 1.9 to 2.9 times Earth's diameter. All appear to possess a large atmosphere. They and their star are located around 100 light-years from Earth.