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A hypothetical Solar System object is a planet, natural satellite, subsatellite or similar body in the Solar System whose existence is not known, but has been inferred from observational scientific evidence. Over the years a number of hypothetical planets have been proposed, and many have been disproved.
In order to leave the Solar System, the probe needs to reach the local escape velocity. Escape velocity from the sun without the influence of Earth is 42.1 km/s. In order to reach this speed, it is highly advantageous to use as a boost the orbital speed of the Earth around the Sun, which is 29.78 km/s.
Object Mass Owner Landing Location Ref. 67P/Churyumov–Gerasimenko: Philae: 100 kg (220 lb) ESA/DLR: 12 November 2014 "Abydos" Rosetta: 1,230 kg (2,710 lb) ESA 30 September 2016 "Sais" 433 Eros: NEAR Shoemaker: 487 kg (1,074 lb) NASA/APL: 12 February 2001: South of Himeros crater [1] 25143 Itokawa: Hayabusa target marker 0.6 kg (1.3 lb ...
List of Solar System probes. List of active Solar System probes; List of space telescopes; Category:Lists of satellites orbiting Earth; List of extraterrestrial orbiters. List of artificial objects in heliocentric orbit, those that orbit the Sun; List of landings on extraterrestrial bodies
Hypothetical astronomical objects have been speculated to exist both inside and outside of the Solar System, and speculation has included different kinds of stars, planets, and other astronomical objects. For hypothetical astronomical objects in the Solar System, see: List of hypothetical Solar System objects
Scientists say they have found new evidence that there is a hidden planet in our solar system. For years, some astronomers have been suggesting that unusual behaviour on the edge of our solar ...
List of Solar System objects; List of gravitationally rounded objects of the Solar System; List of Solar System objects most distant from the Sun; List of Solar System objects by size; Lists of geological features of the Solar System; List of natural satellites (moons) Lists of small Solar System bodies; Lists of comets; List of meteor showers ...
Image credits: The inner detail #5 Solar Panels. While both solar panels and plant leaves harvest energy from the sun, a team at Princeton University took biomimicry in solar panels a step further ...