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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 ...
Such materials include cosmic dust and meteorites, as well as samples brought to Earth by sample return missions from the Moon, asteroids and comets, as well as solar wind particles. Extraterrestrial materials are of value to science as they preserve the primitive composition of the gas and dust from which the Sun and the Solar System formed.
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 ...
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
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 ...
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