Dust Hip-Deep on Phobos.

Landing on the Martian Moon Phobos might be harder than previously thought. The reason: Moon dust . Recent photographs of Phobos have indicated that a layer of fine powder estimated to be a meter deep covers the whole surface. Evidence comes from infrared pictures that indicate the rapid speed that Phobos ' surface cools after sunset. The above high-resolution picture of Phobos was taken last month by the Mars Global Surveyor spacecraft now orbiting Mars . The larger of two Martian moons, measures about 20 kilometers across, and orbits so close that Mars' gravity should rip it apart in another 50 million years.