Scientists have found a deep cave on the Moon that they believe could be an excellent shelter for astronauts. This newly-discovered cave or tunnel is at least 45 meters wide and between 30 and 80 meters long. Researchers think this might be just the beginning of a longer lava-formed tunnel, with more caves likely to be found. Study co-author Leonardo Carrer, an assistant professor in the Department of Information Engineering and Computer Science at the University of Trento in Italy, explained in an email per CNN: “Lunar caves have remained a mystery for a long time. Scientists hypothesized the…