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Topic: Planetary habitability

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	Astrobiology Narrative @ NaturalResearch.org (Natural Research) (Site not responding. Last check: 2007-10-10)
		By examining planetary spectra it will be possible to determine the basic composition of an extrasolar planet's atmosphere and surface; given this knowledge, it may be possible to assess the likelihood of life being found on that planet.
		An estimate for the number of planets with (intelligent) extraterrestrial life can be gleaned from the Drake equation, essentially an equation expressing the probability of intelligent life as the product of factors such as the fraction of planets that might be habitable and the fraction of planets on which life might arise.
		It has been suggested that the peculiarities of our solar system (for example, the presence of Jupiter as a protective 'shield' or the planetary collision which created the Moon) may have greatly increased the probability of intelligent life arising on our planet.
	www.naturalresearch.org /encyclopedia/Astrobiology (1649 words)

	> Planet at abcworld.net (Site not responding. Last check: 2007-10-10)
		All of the accepted planets in the solar system are named after Roman gods, except for Uranus, which is named after a Greek god, and the Earth which was not seen as a planet by the ancients (instead considered the centre of the universe).
		Several of the largest of these have challenged the planetary status quo, as they are both spherical and larger than the bodies in the Mars-Jupiter asteroid belt, and are similar in size, orbit and composition to Pluto.
		No interstellar planet is known to date, but their existence is considered a likely hypothesis based on computer simulations of the origin and evolution of planetary systems, which often include the ejection of bodies of significant mass.
	abcworld.net /Planet.html (2323 words)

	James Kasting
		Biosignatures and Planetary Properties to be Investigated by the TPF Mission, JPL Publication 01-008, California Inst.
		Ultraviolet radiation from F and K stars and implications for planetary habitability, Origins of Life 27, 413-420.
		In: Origin and Evolution of Planetary and Satellite Atmospheres, S.K. Atreya, J.B. Pollack, and M.S. Matthews, eds., University of Arizona Press, Tucson, pp.
	www.geosc.psu.edu /~kasting/PersonalPage/Biblio.htm (2167 words)

	SORS National Museum of Natural History
		NMNH contributes to these studies by drawing on invaluable collections of minerals, rocks, meteorites and data on global volcanic activity found in the Departments of Mineral Sciences.
		Research strategies include: Planetary Formation and Evolution to advance knowledge and understanding of how planetary systems form and evolve; Evolution of Earth-like Planets to focus research on how Earth-like planets evolve; and Planetary Habitability to increase our knowledge and understanding of what makes planets suitable for life.
		Research strengths include meteoritics, mineralogy, petrology, and volcanology.
	www.si.edu /ofg/Units/sorsnmnh.htm (14664 words)

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