Scientists have lucah filemlong suspected the moon may harbor dark labyrinths. They now have proof one exists.
In 2010, NASA's Lunar Reconnaissance Orbiter, a satellite orbiting the moon, captured imagery of an intriguing pit on the moon's surface, in the same region where the Apollo 11 astronauts landed. It was unknown if this was part of greater caverns, but planetary scientists have reanalyzed the spacecraft's observations and determined it is indeed a cave. And elsewhere on the moon, there could be many more.
"We're just seeing the tip of the iceberg," Wes Patterson, a planetary scientist at Johns Hopkins University Applied Physics Laboratory who coauthored the new research in Nature Astronomy, told Mashable.
These caverns are most likely a lava tube, a geologic phenomenon created by volcanic eruptions. Found in regions around Earth, lava tubes are created by molten rock, or magma, leaking up near or onto a world's surface, and forming these natural tunnels. Tubes form from crusted-over lava, and the conduits are emptied when lava drains out or is diverted elsewhere. You can walk though giant lava tubes on Earth.
To determine if the pit was part of a greater tunnel system, the researchers looked at other data collected by the Lunar Reconnaissance Orbiter, specifically from a radar instrument called the Miniature Radio-Frequency. While flying over the pit in the volcanic plains of Mare Tranquillitatis (popularly called the "Sea of Tranquility"), the spacecraft sent a signal into the opening, which bounced back, ultimately providing (with the help of geometry and computer simulations) evidence of a tunnel at least some 130 feet (40 meters) wide and perhaps as much as 80 meters, or some 260 feet, long. It turns out the pit is actually a skylight.
"This is our first direct evidence of a conduit associated with one of those pits," Patterson said.
To buttress their lunar results, the researchers performed a similar analysis on a lava tube here on Earth. Their process worked.
Different pits observed by NASA's Lunar Reconnaissance Orbiter. The middle pit in the top row, labeled for the region "Mare Tranquillitatis," leads to the recently identified cave. Credit: NASA / GSFC / Arizona State University Such a tunnel isn't simply an intriguing geologic find. It could prove vital for future moon exploration, or colonization.
"It is a place that can protect us," Patterson said.
On the moon's surface, astronauts from NASA and other agencies will be threatened by a quadruple whammy of micrometeorites, extreme cold, extreme heat, and radiation — particularly from the sun. The moon lacks an atmosphere, meaning, for example, humans would be exposed to temperatures reaching some 260 degrees Fahrenheit (127 Celsius) on the moon's illuminated side. They'll need shelter. (The space agency plans to return astronauts to the moon as soon as late 2026.)
"It is a place that can protect us."
"We could build things on the moon that would be just as safe as sitting in a lava tube, but it would take a lot more infrastructure to do so," Patterson noted.
Lava tubes might not be the only caverns on the moon. Conduits created by intense, heat-generating impacts might exist in other regions of the moon, near the poles. But this large lava tube in the Sea of Tranquility might be necessary for a future moon base, or landing area.
And there could be much bigger, or interconnected, caverns out there. What else will future observations, perhaps from future moon-orbiting spacecraft, reveal about the moon's lava tubes?
"They may create extensive networks," Patterson said.
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