Have any ideas on this?

Not everyone knows Mars had an atmosphere and still has some left.  Over the last year or so there have been never before pics of the red planet.  The curiosity rover has sent back some amazing information about the planet, atmosphere and surface.  And here is a bit more about what they think may happen in the future:

There is plenty of evidence that Mars at one time had an atmosphere that allowed water to flow on its surface. What happened to it? To find out, NASA’s MAVEN spacecraft is flying high above the Red Planet with a battery of sensors. While previous Mars orbiters have peered down at the planet’s surface, MAVEN is spending part of its time gazing at the stars, looking for subtle changes in their color as they dip through the limb of Mars and set below the horizon.

Let’s find out more about what the atmosphere may look like in the video on page 2

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