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Hellas
[′hel·əs](astronomy)
The largest impact basin on Mars, approximately 1240 miles (2000 kilometers) across and 2.5 miles (4 kilometers) deep, appearing as a bright circular region in earth-based telescopes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Hellas
a name used by several ancient writers for a region in northern Greece. It was applied by Homer to an area in southern Thessaly and by Aristotle to an area in Epirus. When all Greeks came to regard themselves as Hellenes, it was applied to Greece as a whole.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.