posted on Jan, 8 2017 @ 01:57 AM
originally posted by: LonnyZone
OK so the sand is blue on Mars, That's interesting!
Most of those images are false-colour, using near-infrared wavelengths along with visible ones in order to better distinguish between different
But yeah, all that "water" is dark sand. The downslope streaks may
be wet, briny sand. Mars has some water ice under the top dust layer.
There's lots of dark sand on Mars, some of it forming impressive dunes:
originally posted by: TheAlleghenyGentleman
One puzzling question is why the dunes are dark compared with the relative bright layered material contained within the crater. The probable answer is
that the source of the dark sand is not local to this crater; rather, this topographic depression has acted as a sand trap."
The sand is basaltic in origin. The reddish light-toned surface of Mars is actually a coating of Iron Oxide (basically, rust), and underneath it there
are all sorts of rock and sand surfaces.
Curiosity rover has been helping us see what's there:
The Mars Reconnaissance Orbiter (MRO) takes some great high-rez images of the martian sand dunes:
P.S. Here's some real water on Mars: www.nasa.gov...
8-1-2017 by wildespace because: (no reason given)