APOD Astronomy Overnight Thread- Dark Sands


Dark Sand Cascades on Mars
Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA

Explanation: They might look like trees on Mars, but they're not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. The above image was taken in 2008 April near the North Pole of Mars. At that time, dark sand on the interior of Martian sand dunes became more and more visible as the spring Sun melted the lighter carbon dioxide ice.


Well, it's the Holiday Season, so if you're thinking of doing any buying thru Amazon, if you click thru our ad near the bottom of the page to do so, we will get a couple pennies for your patronage. Thank you in advance.

  • Richard Thomas

    I notice that Amazon will donate a couple of pennies to you if there is a click through on their advert here and good luck to you for supping with that particular devil.  That's more than they pay to the British people for the profits they make in doing business in our country.  They are in good company with Starbucks and Google which is why, encouraged by Margaret Hodge, Chair of the UK's Parliamentary Public Accounts Committee, there is a movement to boycott these companies until they pay their fair share.  

    I hope anyone reading this notices the comment and adds their support to action against these grasping (I was going to use a profanity) companies.