Hellas

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Hellas

[hel-uhs]
noun
an area in the southern hemisphere of Mars, appearing as a light region when viewed telescopically from the earth.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Hellas (ˈhɛləs)
 
n
transliteration of the Ancient Greek name for Greece

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

hellas

enormous impact basin in the southern hemisphere of Mars and the planet's largest recognizable impact feature. Centred at roughly 40 S, 290 W, Hellas measures about 7,000 km (4,400 miles) across, including the broad elevated ring surrounding the depression, and 8 km (5 miles) deep. Its floor, covered with partly eroded sediments, is the lowest place on Mars. The basin was probably created by collision with an asteroid very early in Mars's history, not long after the planet formed.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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