Amateur astronomers have made an unexpected discovery: massive plumes spouting up at least 125 miles from the surface of Mars. Two plumes, up to 620 miles wide, were spotted over the Terra Cimmeria area in the red planet's Southern Hemisphere by at least 18 people over two 10-day periods in March and April 2012, Discovery News reports.
A witness tells the BBC one plume looked like a "projection sticking out of the side of the planet." They appeared to form during cold mornings and changed "from double blob protrusions to pillars or finger-plume-like morphologies," according to a study in Nature.
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