An article published in the journal “Earth and Planetary Science Letters” describes a research about Arsia Mons, a volcano on the planet Mars. A team led by Jacob Richardson of NASA’s Goddard Space Flight Center examined high-resolution images taken by the MRO (Mars Reconnaissance Orbiter) space probe to determine that Arsia Mons was at its peak of activity about 150 million years ago and that its last activity probably ended about 50 million years ago.