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Nereus (crater)
Nereus is a small impact crater lying situated within the Margaritifer Sinus quadrangle (MC-19) region of the planet Mars with a diameter of about . It is located just south of the planet's equator〔(Google Mars KML file tracing Opportunity's route ) (includes coordinates), Tesheiner, UnmannedSpaceflight.com, 2009.〕 on the relatively smooth Meridiani Planum (plain).〔(Panorama of Nereus crater ), hortonheardawho, Flickr, 2009-10-14.〕
It was discovered by the Opportunity Mars rover on Sol 2010 (2009-09-19), being noticed because it is surrounded by jagged rocks, and was the Astronomy Picture of the Day for 2009-10-19.
It is named for Nereus a Greek god who lived with the Nereids in the Aegean Sea.〔Hesiod, ''Theogony'' 233-36, is unequivocal that Nereus is ''the'' Old Man of the Sea (ἅλιος γέρων), whereas the ''Odyssey'' refers the sobriquet to Nereus (xxiv.58) to Proteus (iv.365, 387), and to Phorkys (xiii.96, 345).〕
==See also==
*List of craters on Mars
*Geology of Mars
*List of surface features of Mars seen by the Opportunity rover
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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