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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 ...
An artist's conception shows a terraformed Mars in four stages of development.. Terraforming or terraformation ("Earth-shaping") is the hypothetical process of deliberately modifying the atmosphere, temperature, surface topography or ecology of a planet, moon, or other body to be similar to the environment of Earth to make it habitable for humans to live on.
The iconic photo of Earth known as The Blue Marble, taken by the crew of Apollo 17 (1972). This and similar images might have popularized Earth as a theme in fiction. [1]: 138 The overwhelming majority of fiction is set on or features the Earth, as the only planet home to humans or known to have life.
The average thickness of the planet's crust is about 50 km, and it is no thicker than 125 kilometres (78 mi), [33] which is much thicker than Earth's crust which varies between 5 kilometres (3 mi) and 70 kilometres (43 mi). As a result, Mars' crust does not easily deform, as was shown by the recent radar map of the south polar ice cap which ...
The word "Earth" is hard for the people of Thalassa to say due to its loss. Thalassa is the world on which most of the story takes place. 50 light years from Earth, it is an ocean world with three volcanic islands, and its own aquatic biota. The planet was colonised by a seed ship in the year 3109.
The story would have concerned a planet in an orbit opposite Earth's, with a society parallel but opposite to it; women were the dominant sex, and all clovers had four leaves. The original script was sent back for rewrites which, due to a pay dispute, were not made until after Susan had left the series; this necessitated further rewriting.
[1] [13] Bizarro World in the Superman franchise is a cubic planet, rendered that shape by the actions of Superman. [1] [9] Earth itself gets turned into a cube in Henry H. Gross's 1987 short story "Cubeworld", and an altogether artificial planet-sized cube is the setting of G. David Nordley's 2009 novel To Climb a Flat Mountain. [9]
Earth orbits the Sun, making Earth the third-closest planet to the Sun and part of the inner Solar System. Earth's average orbital distance is about 150 million km (93 million mi), which is the basis for the astronomical unit (AU) and is equal to roughly 8.3 light minutes or 380 times Earth's distance to the Moon.