by Calla Cofield, Space.com Staff Writer | February 17, 2015 12:31pm ET
Scientists are puzzled by a mysterious plume that erupted off the surface of Mars in 2012. On the right, the location of the plume is identified in the yellow circle. On the left, close-up views of the changing plume morphology in images taken by W. Jaeschke and D. Parker on March 21, 2012. The background is a region on Mars known as Terra Cimmeria, where the plume formed. (Image source NOAA).
Credit: Grupo Ciencias Planetarias (GCP) - UPV/EHU
A mystery is brewing on Mars: Amateur astronomers spotted enormous plumes erupting off the Red Planet's surface, leaving scientists puzzled.
More than 155 miles (250 kilometers) high and hundreds of miles across, the baffling plumes were spotted by amateur astronomers in the spring of 2012. The plumes reflect sunlight, which means they could be made of water ice, carbon dioxide ice or dust. But clouds made of those materials would be hard to explain with current models of the Martian atmosphere, scientists say.
Images of Mars from the last 20 years reveal that shorter plumes, reaching heights of about 62 miles (100 km), occasionally flare up from the planet's surface. An image by the Hubble Space Telescope from 1997 revealed another abnormally high plume, similar to the one seen in 2012, according to a statement from the European Space Agency (ESA). [7 Biggest Mysteries On Mars]
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