Martian Meteorite Points to Ancient Hydrothermal Activity

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By Katherine Kornei, Eos/AGU. 

Excerpt: In 2011, a striking black rock about the size of an apple was discovered in the Sahara desert. ...that meteorite, which has come to be known as NWA 7034, or “Black Beauty,” is different from most other meteorites: It’s a chunk of Mars. ...Tiny grains of zircon from NWA 7034 have now revealed that hydrothermal activity likely persisted in Mars’s crust 4.45 billion years ago. That’s the earliest indirect evidence of water on the Red Planet.... 

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