NASA may already have proof life once existed on another planet. Scientists might never get to find outScienceOct 12 at 7:46 AM – Oct 12 at 11:03 PM3 outletsCNNNASA may already have proof life once existed on another planet. Scientists might never get to find out seen Oct 12 at 7:46 AMCTV NewsNASA may already have proof life once existed on another planet. Scientists might never get to find out seen Oct 12 at 9:56 AMRNZNASA may already have proof life once existed on another planet seen Oct 12 at 11:03 PM