Daily Almanac for
Nov 30, 2009
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he•li•o•sphere



Pronunciation: (hē'lē-u-sfēr"), [key]
—n. Astron.
the region around the sun over which the effect of the solar wind extends.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

helioscopeheliostat
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