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Credit & Copyright: Dick Hutchinson
Explanation:
Aurora can make spectacular sights.
This particular aurora
was photographed hovering over the town of Circle, Alaska.
Although Aurora
might first appear to be moonlit clouds, they
only add light to the sky, and hence can not block
background stars from view. Called "northern lights"
in the northern hemisphere of the Earth,
aurora are caused by charged particles streaming from the Sun
entering the Earth's atmosphere. If viewed from space, aurora
glow in X-ray light
as well as in the visible! Several
WWW sites can tell you if aurora are predicted to be visible in your area.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day