High-resolution cameras aboard the Japanese Kaguya spacecraft first spotted the irregularly shaped chasm, located in Mare Ingenii on the moon's southern hemisphere.Now, NASA's Lunar Reconnaissance Orbiter has taken a new, up-close photo of the moon pit from lunar orbit.
"Only three have been discovered thus far, so I believe it is safe to state that skylights (pits) are rare at the 100-meter scale," Mark Robinson, principal investigator for the Lunar Reconnaissance Orbiter Camera (LROC) at Arizona State University, told SPACE.com in an e-mail.
Mare Ingenii, also called the "sea of cleverness," is best known for its prominent lunar swirls, which are highly reflective surface features that are associated with magnetic anomalies. The new images of the region from LROC show a giant pit measuring about 427 feet (130 meters) in diameter.
The boulders and debris resting on the floor of the cavity are partially illuminated and likely originated at the surface, falling through the pit opening during its collapse. The hole is thought to be the result of a partially collapsed lava tube.