The latest NASA "Image of the Day" image.

.
Chasma Boreale, a long, flat-floored valley, cuts deep into Mars' north polar icecap. Its walls rise about 4,600 feet, or 1,400 meters, above the floor.
.
Where the edge of the ice cap has retreated, sheets of sand are emerging that accumulated during earlier ice-free climatic cycles. Winds blowing off the ice have pushed loose sand into dunes and driven them down-canyon in a westward direction.
.
This scene combines images taken during the period from December 2002 to February 2005 by the Thermal Emission Imaging System instrument on NASA's Mars Odyssey was part of a special series of images marking the orbiter as the longest-working Mars spacecraft in history.
- Image Credit: NASA/JPL-Caltech/ASU
Τρίτη, Μάρτιος 15, 2011 6:00:00 πμ
-
No comments:
Post a Comment