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Amateur astronomers have spotted two strange, cloud-like plumes high over Mars, deepening the mystery of what constitutes the Red Planet's atmosphere, a study said Monday. The "clouds" -- if that is indeed what they were -- were seen at high altitude, at about 200-250 kilometres, roughly above Terra Cimmeria, which is part of Mars' rugged southern highlands, according to the paper. The plumes could be made of particles of water or carbon dioxide, said the paper published in the journal ...

'Cloud' over Mars leaves scientists baffled

Regional dust storm activities over northern hemisphere of Mars - captured by Mars Color Camera (MCC) on-board Mars Orbiter Mission (MOM).