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Orrery. A small orrery showing Earth and the inner planets. An orrery is a mechanical model of the Solar System that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; however, since accurate scaling is often ...
The Great Wall of China, at 6,352 km or 3,947 mi long, is a megastructure. This picture was taken near Beijing in February 2005. A megastructure is a very large artificial object, although the limits of precisely how large vary considerably. Some apply the term to any especially large or tall building. [1][2] Some sources define a megastructure ...
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.
A Dyson sphere is a hypothetical megastructure that encompasses a star and captures a large percentage of its solar power output. [1][2][3] The concept is a thought experiment that attempts to imagine how a spacefaring civilization would meet its energy requirements once those requirements exceed what can be generated from the home planet's ...
The website [56] maps out the planetary orbits and shows everyday objects to scale the planets (e.g. a golf ball for Mars) Saskatoon Solar Walk Saskatoon, Saskatchewan: 1 : 1,275,600,000 109 cm 1 cm 110 m 4,500 m Personal and public art installation. Eise Eisinga Visvliet [57] Visvliet, The Netherlands: 1: 870,000,000 160 cm 1.5 cm 172 m n/a
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 types ...
SolarQuest is a space -age real estate trading board game published in 1985 and developed by Valen Brost, who conceived the idea in 1976. [1] The game is patterned after Monopoly, but it replaces pewter tokens with rocket ships and hotels with metallic fuel stations. Players travel around the Sun acquiring monopolies of planets, moons, and man ...
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems). It suggests the Solar System is formed from gas and dust orbiting the Sun which clumped up together to form the planets. The theory was developed by Immanuel Kant and ...