It's one thing to step onto a foreign world's surface; it's another matter entirely to set foot beneath its surface, trusting your safety to the structural integrity of a tunnel-like cave.
Are Moon Caves Safe for Astronauts? Earth's Lava Tubes Can Help Us Find Out
SPACE.com - 25 Sep 2018 13:25
It's one thing to step onto a foreign world's surface; it's another matter entirely to set foot beneath its surface, trusting your safety to the structural integrity of a tunnel-like cave.
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