Scientists have confirmed a cave on the moon, not far from where Neil Armstrong and Buzz Aldrin landed 55 years ago, and suspect there are hundreds more that could house future astronauts.
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An Italian-led team reported on Monday that there is evidence for a sizable cave accessible from the deepest known pit on the moon.
It is located at the Sea of Tranquility, 400km from Apollo 11's landing site.
The pit, like the more than 200 others discovered on the moon, was created by the collapse of a lava tube.
Researchers analysed radar measurements by NASA's Lunar Reconnaissance Orbiter and compared the results with lava tubes on earth.
Their findings appeared in the journal Nature Astronomy.
The radar data reveals only the initial part of the underground cavity, according to the scientists.
They estimate it is at least 40 metres wide and tens of metres long, probably more.
"Lunar caves have remained a mystery for over 50 years. So it was exciting to be able to finally prove the existence" of one, Leonardo Carrer and Lorenzo Bruzzone of the University of Trento, wrote in an email.
Most of the pits seem to be located in the moon's ancient lava plains, according to the scientists.
There also could be some at the moon's south pole, the planned location of NASA's astronaut landings later this decade.
Permanently shadowed craters there are believed to hold frozen water that could provide drinking water and rocket fuel.
During NASA's Apollo program, 12 astronauts landed on the moon, beginning with Armstrong and Aldrin on July 20, 1969.
The findings suggest there could be hundreds of pits on the moon and thousands of lava tubes.
Such places could serve as a natural shelter for astronauts, protecting them from cosmic rays and solar radiation as well as from micrometeorite strikes.
Building habitats from scratch would be more time-consuming and challenging even when factoring in the potential need of reinforcing the cave walls to prevent a collapse, the team said.
Rocks and other material inside these caves - unaltered by the harsh surface conditions over the eons - also can help scientists better understand how the moon evolved, especially involving its volcanic activity
Australian Associated Press
