- Prince Olav Coast, Antarctica -- Ice fringes the coast of
Antarctica, but not all of that ice looks or acts the same. This
cloud-free view of East Antarctica's Prince Olav Coast shows a
few types of ice along Antarctica's coast. NASA's Terra
satellite captured the image on Nov. 12, 2007. - Layered Ice
Deposits Near North Pole of Mars -- This false-color image of
the north polar layered ice deposits on Mars taken on Sept. 20,
2007, by the Mars Reconnaissance Orbiter has been processed to
emphasize color variations. Some of the color variations may be
caused by small amounts of water frost on the surface, or they
may be due to variations in dust composition within the layered
deposits. - Petermann Glacier, Greenland -- Seasonal changes in
Greenland ice sheets during summertime are apparent in this
image of the Petermann Glacier, located in the far northwestern
part of the island. - Northwest Passage Nearly Open -- Explorers
have sought a Northwest Passage for centuries, meeting with
disappointment and tragedy