zorg.ch
7:06 Uhr
Events
Forum
Games
Wetten
Rezepte
Tauschbörse
Books
Space
User
Übersicht
Astronomy Picture of the Day
Angular Sand on Martian Hills
Bild Note: 0
(0 Votes)
⏴ previous
Bild Upload von 18.02.2016 21:43
next ⏵
zorg.ch
#81216
by
[z]Barbara Harris
@
25.10.2005 00:00
- nach oben -
Angular Sand on Martian Hills
Explanation:
Why isn't this sand round?
The robotic
Spirit rover
currently rolling across
Mars
has found
notably angular sand
in the
Columbia Hills
on Mars.
Previously, small bits of sand found in the plains of
Gusev Crater
were significantly
more round
.
The finding indicates that angular hill
sand
has tumbled less and likely traveled a shorter distance than the
corresponding round plain sand.
Such tumbling has the general effect of making sand and rocks
increasingly round and with fewer sharp edges.
Pictured above
, as taken last month, are angular sand grains magnified by Spirit's
Microscopic Imager
.
The above frame spans about three centimeters.
Credit & Copyright