Alexa
traveller space dreamer
This is really cool ! NASA released a photo from Lyot Crater showing blue dunes. I wonder what lies beneath and what they are made of.
Once in a Blue Dune
Once in a Blue Dune
Surely there must be giant sandworms in the vicinity? (I think spice is said to have a blue luminescence in one of those books.)
Mars is covered with iron compounds, and iron compounds can be very different colours depending on how the electrons between atoms are shared.
Mars normally gets its red colour from Iron (III) Oxide - aka rust - but I'd guess the above picture shows something like an accumulation of Iron (II) Sulphate, which is blue.
Or is it actually the opposite for them to have stayed (floated) above the surrounding material. Or maybe they just have to be larger particles; if you stir up a container of different sized gravel all of the same rock (and therefore density) don't the larger particles always end up on the surface?I found the dunes in the field near it even more interesting. They must be of a dense/heavy material to be so defined.
K2
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