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Dust

Dust is a general name for minute solid particles with diameters less than 20 thou (500 micrometers). Particles in the atmosphere arise from various sources such as soil dust lifted up by wind, volcanic eruptions, and pollution. Dust in homes, offices, and other human environments consist primarily of human skin cells, but also contain small amounts of plant pollen, human and animal hairs, textile fibers, paper fibers, minerals from outdoor soil, and many other materials which may be found in the local environment.

For more information about Dust, read the full article at Wikipedia.
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Dark shadows on Mars: Scene from durable NASA rover

(Phys.org) -- Like a tourist waiting for just the right lighting to snap a favorite shot during a stay at the Grand Canyon, NASA's Mars Exploration Rover Opportunity has used a low sun angle for a memorable ...

Space & Earth / Space Exploration

created May 23, 2012 | popularity 5 / 5 (10) | comments 9 | with audio podcast