Scientists have found the first solid proof of a cave hiding beneath the moon's surface, sitting just a few hundred kilometres from the spot where Neil Armstrong and Buzz Aldrin took humanity's first steps in 1969. Radar data collected by NASA's Lunar Reconnaissance Orbiter shows the cave leads off a deep pit in the Sea of Tranquility, researchers reported in the journal Nature Astronomy. The find has changed the theories about where future astronauts choose to pitch their tents.
