Pakistan

Curiosity’s discovery: On Mars, evidence of ancient lake found

The crater lacks large inflow channels, so the lake was likely fed by groundwater, scientists said.

Afp January 22, 2013

WASHINGTON: A US spacecraft orbiting Mars has provided evidence of an ancient crater lake fed by groundwater, adding further support to theories that the Red Planet may once have hosted life, Nasa said.

Spectrometer data from Nasa’s Mars Reconnaissance Orbiter (MRO) shows traces of carbonate and clay minerals usually formed in the presence of water at the bottom of the 1.4-mile (2.2-kilometer) deep McLaughlin Crater. “These new observations suggest the formation of the carbonates and clay in a groundwater-fed lake within the closed basin of the crater,” NASA said of the findings, which were published in the online edition of Nature Geoscience.

The crater lacks large inflow channels, so the lake was likely fed by groundwater, scientists said. The latest observations “provide the best evidence for carbonate forming within a lake environment instead of being washed into a crater from outside,” said Joseph Michalski, lead author of the paper.

The 57-mile-wide crater sits at the low end of a regional slope several hundreds of miles long and, as on Earth, groundwater-fed lakes would be expected to occur at low elevations.

Published in The Express Tribune, January 22^nd, 2013.