nytimes August 4, 2021 7:01pm Gilbert V. Levin, Who Said He Found Signs of Life on Mars, Dies at 97 #levingilbertv #deathsobituaries #marsvikinglanderspacecraft #nationalaeronauticsandspaceadministration #spaceandastronomy #marsplanet #science #news Gilbert V. Levin, Who Said He Found Signs of Life on Mars, Dies at 97 Most planetary scientists dismissed his conclusions, but he remained steadfast that the experiment he conducted in the mid-1970s had been a success.