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An artificial planet [1] (also known as a planetary replica or a replica planet) [2] is a proposed stellar megastructure. Its defining characteristic is that it has sufficient mass to generate its own gravity field that is strong enough to prevent atmosphere from escaping , [ 3 ] [ 4 ] although the term has been sometimes used to describe other ...
Counter-Earth, a planet situated on the other side of the Sun from that of the Earth. Fifth planet (hypothetical), historical speculation about a planet between the orbits of Mars and Jupiter. Phaeton, a planet situated between the orbits of Mars and Jupiter whose destruction supposedly led to the formation of the asteroid belt. This hypothesis ...
A planet that is located outside the Milky Way galaxy Eyeball planet: A tidally locked planet where uneven heating of the surface induces spatial features resembling a human eye. Helium planet: A gas giant composed mainly of helium instead of hydrogen. Hycean planet / ˈ h aɪ ʃ ən / A hot, water-covered planet with a hydrogen-rich atmosphere ...
A superhabitable world is a hypothetical type of planet or moon that is better suited than Earth for the emergence and evolution of life. The concept was introduced in a 2014 paper by René Heller and John Armstrong, in which they criticized the language used in the search for habitable exoplanets and proposed clarifications. [ 2 ]
If you’ve ever indulged in the habit of cloudspotting, you’ve probably seen all kinds of things in the sky, from animals and faces to UFOs and cartoon characters.
Science fiction bibliographers E. F. Bleiler and Richard Bleiler, in the 1998 reference work Science-Fiction: The Gernsback Years, list various imaginary constituents of the pre-modern "science-fiction Solar System". Among these are planets between Venus and Earth, planets on the inside of a hollow Earth, and a planet "behind the Earth". [16]
It will be visible in the constellation Gemini and will appear in the eastern part of the sky as night falls shortly after sunset (around 3:00 UTC per EarthSky.org, AKA 10 p.m. EST) and then be in ...
Pages in category "Fictional planets" The following 50 pages are in this category, out of 50 total. ... Mobile view; Search. Search. Category: Fictional planets.