Editing Megastructure (section)

===Orbital structures===<!-- This section is linked from [[Space science]] -->
* An [[orbital ring]] is a dynamically elevated ring placed around the Earth that rotates at an angular rate that is faster than orbital velocity at that altitude, stationary platforms can be supported by the excess centripetal acceleration of the super-orbiting ring (similar in principle to a [[Launch loop]]), and ground-tethers can be supported from stationary platforms.
* The [[Bernal sphere]] is a proposal for a spherical space colony with a maximum diameter of 16 kilometers. It would have gravity at the equator, and gradually turn to zero G at the poles.
* [[Rotating wheel space station]]s, such as the [[Stanford torus]], are wheel-like space station which produce artificial gravity by rotation. Typical designs include transport spokes to a central hub used for docking and/or micro-gravity research.
* The related concepts, [[O'Neill cylinder|O'Neill]] and [[McKendree cylinder|McKendree]] cylinders, are both pairs of counter-rotating cylinders containing habitable areas inside and creating 1g on their inner surfaces via centripetal acceleration. The scale of each concept came from estimating the largest 1g cylinder that could be built from [[steel]] (O'Neill) or [[carbon fiber]] (McKendree).<ref>{{cite book |last=O'Neill |first=Gerard K. |title=[[The High Frontier: Human Colonies in Space]] |publisher=[[William Morrow and Company]] |date=1977 |isbn=0-688-03133-1 }}</ref><ref>{{Cite conference |url=http://www.zyvex.com/nanotech/nano4/mckendreePaper.html |title=Implications of Molecular Nanotechnology Technical Performance Parameters on Previously Defined Space System Architectures |conference=The Fourth Foresight Conference on Molecular Nanotechnology |conference-url=http://www.zyvex.com/nanotech/nano4.html |date=9–11 November 1995 |location=Palo Alto, California |last=McKendree |first=Thomas Lawrence }}</ref>
* Hollowed asteroids (or [[Space habitat#Other designs|Bubble worlds]] or [[Terrarium (space habitat)|Terraria]]) are spun on their axis for simulated gravity and filled with air, allowing them to be inhabited on the inside. In some concepts, the asteroid is heated to molten rock and inflated into its final form.<ref>{{cite book |last1=Cole |first1=Dandridge M. |author-link1=Dandridge MacFarlan Cole |last2=Cox |first2=Donald W. |title=Islands in Space: The Challenge of the Planetoids. |publisher=[[Chilton Book Co]] |location=Philadelphia |date=1964 |asin=B0007DZSR0 }}</ref><ref>{{cite book |last=Niven |first=Larry |author-link=Larry Niven |title=A Hole in Space |chapter=[[Bigger Than Worlds]] |pages=111–126 |publisher=[[Ballantine Books]] |location=New York |date=1974 |asin=B002B1MS6U }}</ref>
* A stellaser is a star-powered [[laser]] or [[maser]].