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Currently, there is strong consensus among astronomers that five members of the Kuiper belt are dwarf planets. [198] [203] Many dwarf planet candidates are being considered, pending further data for verification. [204] Pluto (29.7–49.3 AU) is the largest known object in the Kuiper belt.
Ordinary (baryonic) matter (4.9%) Dark matter (26.8%) Dark energy (68.3%) [ 6 ] The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach ...
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 ...
Many associated the classical planets (these star-like points visible with the naked eye) with deities, in part due to their puzzling forward and retrograde motion against the otherwise fixed stars, which gave them their nickname of "wanderer stars", πλάνητες ἀστέρες (planētes asteres) in Ancient Greek, from which today's word ...
It contrasts the darker, cratered terrain of Belton Regio at lower left. Surface temp. Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most- massive known object to directly orbit the Sun.
The currently accepted method by which the planets formed is accretion, in which the planets began as dust grains in orbit around the central protostar. Through direct contact and self-organization , these grains formed into clumps up to 200 m (660 ft) in diameter, which in turn collided to form larger bodies ( planetesimals ) of ~10 km (6.2 mi ...
List of directly imaged exoplanets. This is a list of extrasolar planets that have been directly observed, sorted by observed separations. This method works best for young planets that emit infrared light and are far from the glare of the star. Currently, this list includes both directly imaged planets and imaged planetary-mass companions ...
List of nearest exoplanets. Fomalhaut b (Dagon), 25 light-years away, with its parent star Fomalhaut blacked out, as pictured by Hubble in 2012. [ 1 ] In 2020 this object was determined to be an expanding debris cloud from a collision of asteroids rather than a planet. [ 2 ] There are 7,026 known exoplanets, or planets outside the Solar System ...