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Island AuroraA brilliant green aurora seems to flow like a river in the skies over Tromsø, Norway (map), in a long-exposure picture taken between late Saturday and early Sunday.Aurorae are created as charged particles, which are constantly streaming from the sun, travel along Earth's magnetic field lines and collide with atoms in the planet's atmosphere. The light shows can be more intense—and can sometimes be seen farther from the Poles—during solar storms.(See pictures of unusual aurorae sparked by a solar storm in August.)
Photograph by Thilo Bubek

Space Photos This Week: Shuttle, Sun-Kissing Comet, More

The space shuttle Discovery by moonlight, a kamikaze comet, and evidence of a Martian flood are among the week's best space pictures.

Published October 28, 2010