Astronomy Martian sand dunes: blowing in the wind Viewing the north pole of the Red Planet, the Mars Global Surveyor spacecraft provides the first evidence that sand dunes there can change appearance over a few months.
(the Mars Global Surveyor spacecraft; provides; the first evidence that sand dunes there can change appearance over a few months) (sand dunes there; can change; appearance over a few months)
the Mars Global Surveyor spacecraft sand dunes there
provides can change
the first evidence that sand dunes there can change appearance over a few months
appearance over a few months