PLANETARY SCIENCE: 'Spiders' Channel Mars Polar Ice Cap
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Updated: Jul 11, 2026

Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Abstract:
Scientists studying the latest high-resolution photos of the martian south polar ice cap think they may have found additional clues to its ebb and flow. These hints of the planet's bizarre atmosphere come from a new class of dramatic-looking terrain features whose dark, multilimbed, vaguely radial designs have earned them the moniker "black spiders," and another group of dusky, spreading features called "dark fans." At a recent gathering here of Mars researchers, a planetary scientist proposed that the spiders might be subsurface gas channels, visible through an unusually transparent section of the martian ice.
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