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Topic: Caloris Planitia

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Caloris Basin

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	Mercury
		Mariner observed a world similar in general respects to the Moon: heavily cratered but with regions of relatively smooth plains, some of which may be the result of ancient volcanic activity, others due to the deposition of ejecta from cratering impacts.
		Its most distinctive features is the Caloris Basin, a colossal, multiringed basin about about 1,350 km (840 miles) in diameter, whose inner floor contains mostly smooth plains, known as Caloris Planitia, but also many ridges and fractures, some of them radial and others arranged in two or three concentric rings.
		There are also great escarpments, up to 1,500 km long and 3 km high, some of which slice through the rings of craters and other features in a way that shows they were formed by compression of the crust when Mercury's interior cooled and shrank.
	www.daviddarling.info /encyclopedia/M/Mercury.html (880 words)

	Encyclopédie :: encyclopedia : Mercure (planète) (Site not responding. Last check: 2007-10-23)
		Le plus remarquable de ces cratères (du moins, sur la portion qui a pu être photographiée) est le Bassin Caloris, un impact météoritique d'un diamètre d'environ 1300 km et qui fut formé après la chute d'un astéroïde d'une taille avoisinant les 150 km il y a près de 3,85 milliards d'années.
		Son nom (« Caloris », chaleur en latin) vient du fait qu'il est situé sur l'un des deux « pôles chauds » de la surface de Mercure qui fait directement face au Soleil lorsque la planète est au plus proche de celui-ci.
		Les scientifiques pensent que ces fractures sont le résultat du choc qui produisit le Bassin Caloris.
	www.encyclopedie.cc /Mercure_(plan%c3%a8te) (6688 words)

	Planetary nomenclature - Wikipedia, the free encyclopedia
		Names for atmospheric features are informal at present; a formal system will be chosen in the future.
		The boundaries of many large features (such as terrae, regiones, planitiae, and plana) are not topographically or geomorphically distinct; the coordinates of these features are identified from an arbitrarily chosen center point.
		Boundaries (and thus coordinates) may be determined more accurately from geochemical and geophysical data obtained by future missions.
	en.wikipedia.org /wiki/Planetary_nomenclature (1504 words)

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