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[[Image:Globus Cassus Ortho.png|thumb|Top and side view of the Globus Cassus]]
'''Globus Cassus''' is an art project and book by Swiss architect and artist Christian Waldvogel presenting a conceptual transformation of [[Earth|planet Earth]] into a much bigger, hollow, [[Artificial planet|artificial world]] with an [[Earth's spheres|ecosphere]] on its inner surface.<ref>{{cite book
| publisher=Lars Müller Publishers
| first=Christian
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| author4=Michael Stauffer | author4-link=Michael Stauffer
| title=Globus Cassus
|
| isbn=3-03778-045-2
}}</ref> It was the Swiss contribution to the 2004 [[Venice Biennale of Architecture|Venice Architecture Biennale]] and was awarded the gold medal in the category "Most beautiful books of the World" at the [[Leipzig Book Fair]] in 2005.<ref>{{cite web
|url = http://www.designboom.com/snapshots/venice04/ch.html
|title = 9th International Architecture Exhibition in Venice, Italy, 2004
|url-status = dead
|archive-url = https://web.archive.org/web/20070926230949/http://www.designboom.com/snapshots/venice04/ch.html
|archive-date = 2007-09-26
}}</ref><ref>{{cite news|title=Preismarathon auf der Buchmesse: Von goldenen Lettern und edlen Federn|url=http://www.spiegel.de/kultur/literatur/preismarathon-auf-der-buchmesse-von-goldenen-lettern-und-edlen-federn-a-347188.html|access-date=16 April 2013|newspaper=Spiegel Online|date=18 March 2005|language=German}}</ref> It consists of a meticulous description of the transformation process, a narrative of its construction, and suggestions on the organizational workings on Globus Cassus.
|url=http://www.globus-cassus.org/index.php?International%20Globus%20Cassus%20Society
|title=International Globus Cassus Society
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|first=Christian
|last=Waldvogel
|
|
|
|
}}</ref> As of August 2012, the Globus Cassus wiki is no longer operational.
==Properties==
{{Unsourced section|date=May 2024}}
{| class="wikitable floatright"
|+Comparison to Earth{{Cn|date=May 2024}}
!
! Globus Cassus
! [[Earth]]
|-
| [[Diameter]]
| 85,000 km
| 15[[%]]
|-
| Diameter with cables
| 318,000 km
| —
|-
| Diameter of [[Moon|Moon's]] [[orbit]]
|
| equal
|-
| Total [[mass]]
| 5.973[[scientific notation|×10<sup>24</sup>]] kg
| equal
|-
| [[Water]] mass
| 1.35×10<sup>18</sup> kg
| equal
|-
| Average depth of [[sea]]
| 3250 m
| 3960 m
|-
| [[Earth's atmosphere|Atmosphere]]
|
| equal
|-
|
| 827 kg/m<sup>3</sup>
| 667%
|-
| Total (inner) [[surface area]]
| 9.620×10<sup>9</sup> km<sup>2</sup>
| 2.22%
|-
| Covered with water
| 7.223×10<sup>8</sup> km<sup>2</sup>
| 47%
|-
| Habitable area
| 5.413×10<sup>8</sup> km<sup>2</sup>
| 11.11%
|}
The proposed megastructure would incorporate all of Earth's matter. Sunlight would enter through two large windows, and [[gravity]] would be simulated by the [[centrifugal effect]]. Humans would live on two vast regions that face each other and that are connected through the empty center. The [[hydrosphere]] and [[Earth's atmosphere|atmosphere]] would be retained on its inside. The ecosphere would be restricted to the [[equator]]ial zones, while at the low-gravity [[Tropics|tropic]] zones a thin atmosphere would allow only for plantations. The [[polar region]]s would have neither gravity nor atmosphere and would therefore be used for storage of raw materials and microgravity production processes.
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==Construction process==
{{Unsourced section|date=May 2024}}
Starting at four precisely defined points in the [[geostationary orbit]], four [[space elevators]] are built. Eventually they become massive towers, each measuring several hundred kilometers in diameter and extending to a length of about 165,000 km. The towers contain elevators which are used to transport silicate building material to the construction sites at geostationary orbit.
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===Plant growth===
The remaining Earth core is dismantled to build the shells that lie in the pole regions. During this process, the massive heat radiation of the core accelerates plant growth and therefore aids the process of establishing a functioning [[biosphere]].
==Literature==
[[Image:Globus Cassus 2004 book cover.jpg|thumb|Book cover]]
*''Globus Cassus'', Lars Müller Publishers, with contributions by [[Boris Groys]], [[Claude Lichtenstein]], [[Michael Stauffer]] and Christian Waldvogel. Awarded the
==See also==
* {{annotated link|Bernal sphere}}
* {{annotated link|Dyson sphere}}
* {{annotated link|Planetary engineering}}
* {{annotated link|Planetary habitability}}
* {{annotated link|Terraforming}}
* {{annotated link|Rendezvous with Rama|''Rendezvous with Rama''}}
==References==
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==External links==
* [https://web.archive.org/web/20071009210510/http://www.waldvogel.com/celestia/ Globus Cassus addon] for [[Celestia]]
* [https://web.archive.org/web/20070926230949/http://www.designboom.com/snapshots/venice04/ch.html 9th international architecture exhibition in venice, italy, 2004 / swiss pavilion: ‘larger earth’], by [[Christian Waldvogel]]
* [http://www.damninteresting.com/?p=926 ''Damn Interesting'' review of Globus Cassus]
[[Category:Megastructures]]
[[Category:Planetary engineering]]
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