Periodicals>Journal Article:  Dyson , Freeman J. (Jun. 3, 1960), Search for Artificial Stellar Sources of Infrared Radiation, Science, New Series, Vol. 131, No. 3414 (Jun. 3, 1960), pp. 1667-1668, Retrieved on 2014-03-16
Folksonomies: astronomy extraterrestrials


16 MAR 2014

 Dyson Spheres

The material factors which ultimately limit the expansion of a technically advanced species are the supply of matter and the supply of energy. At present the material resources being exploited by the human species are roughly limited to the biosphere of the earth, a mass of the order of 5 X 10^19 grams. Our present energy supply may be generously estimated at 10^20 ergs per second. The quantities of matter and energy which might conceivably become accessible to us within the solar system are ...
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The energy and time required to dismantle a planet and turn it into a biosphere surrounding a sun.