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Astronomy Picture of the Day -- Valles Marineris: The Grand Canyon of Mars
| May 11, 2014
| (see photo credit)
Posted on 05/12/2014 8:54:54 PM PDT by SunkenCiv
Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep. The origin of the Valles Marineris remains unknown, although a leading hypothesis holds that it started as a crack billions of years ago as the planet cooled. Several geologic processes have been identified in the canyon. The above mosaic was created from over 100 images of Mars taken by Viking Orbiters in the 1970s.
(Excerpt) Read more at 126.96.36.199 ...
TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; mars; science
[Credit: Viking Project, USGS, NASA]
posted on 05/12/2014 8:54:54 PM PDT
To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; steelyourfaith; Mmogamer; dayglored; ...
posted on 05/12/2014 8:56:12 PM PDT
posted on 05/12/2014 8:57:04 PM PDT
(Vote for Conservatives not for Republicans!)
Does that look like that missing airliner just to the left?
posted on 05/12/2014 8:58:48 PM PDT
(I'll take a bad dog over a good politician any day!)
Talk about your epic crack.
Well, people are crazy about non-waterfront property...
posted on 05/12/2014 9:41:47 PM PDT
Give Malaysia time, they’ll saddle on that idea.
posted on 05/12/2014 9:42:22 PM PDT
posted on 05/12/2014 9:42:25 PM PDT
A little Bondo and that’ll buff right out!
posted on 05/12/2014 10:29:55 PM PDT
("No man left behind" is more than an Army Ranger credo it's the character of America.)
Whatever it was, it left a mark.
posted on 05/13/2014 4:56:34 AM PDT
by left that other site
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