PASADENA, Calif., June 3 (UPI) -- The U.S. space agency says rocks examined by Mars rover Spirit hold evidence of a wet, non-acidic ancient environment that might have been favorable for life.
NASA scientists said it took four years of analysis to determine there were high concentrations of carbonate in the rocks Spirit examined during late 2005. Carbonate originates in wet, near-neutral conditions, but dissolves in acid. The ancient water indicated by the find was not acidic.