| 词条 | Playfair (Martian crater) |
| 释义 |
| titlecolor = #FA8072 | title = Playfair Crater | image = PlayfairMartianCrater.jpg | caption = Location of Playfair Crater. | region = Mare Australe quadrangle | coordinate_title = Coordinates | globe = Mars | coordinates = {{coord|78.1|S|126.2|W|globe:mars_type:landmark|display=inline,title}} | diameter = 64.2 km | eponym = John Playfair }}Playfair is an impact crater in the Mare Australe quadrangle of Mars, located at 78.1°S latitude and 126.2°W longitude. It measures 64.2 kilometers in diameter and was named after Scottish scientist and mathematician John Playfair. The naming was approved in 1973, by the IAU's Working Group for Planetary System Nomenclature.[1] ImagesThis picture was taken in the spring season on Mars when the temperature was rising. During the winter, much frost accumulates. When the temperature goes up in the spring, the frost disappears in the thin Martian atmosphere and leaves behind the dark ground. The surface appears covered with dark spots when this defrosting process is occurring.[2] The dark spots can be seen in some of the pictures below. See also
References1. ^{{cite web|title=Gazetteer of Planetary Nomenclature {{!}} Playfair|url=http://planetarynames.wr.usgs.gov/Feature/4760|website=usgs.gov|publisher=International Astronomical Union|accessdate=4 March 2015}} {{Geography of Mars}}2. ^http://www.jpl.nasa.gov/news/news.php?release=2013-034 2 : Mare Australe quadrangle|Impact craters on Mars |
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