Ghostly blue white frost covering the surface of is 'dirty' and mixed with dust grains, study reveals, keeping much of it hidden to the naked eye.A team from 's Jet Propulsion Laboratory in used data from the Mars Odyssey orbiter, with visible light and heat sensitive cameras to look at the frost.When scientists looked at images of the Martian surface taken with the NASA orbiter in visible light, the kind seen by the human eye, they saw ghostly, blue-white morning frost illuminated by the rising sun.
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