Scientists have been conducting experiments in lava tunnels at Hawaii's Mauna Loa volcano to simulate potential living and research conditions at similar underground sites on the moon and Mars, Hawaii Space Exploration Analog and Simulation Director Michaela Musilova explained at a conference last month. The scientists wear suits designed for exploring other planets while researching geology and life forms in the tunnel habitat, which could offer protection and research data for explorers who may visit the moon and other planets, Musilova says.