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NASA has released more than 800 gigabytes of lunar science data from its Artemis II mission, making photographs, video, audio recordings and crew annotations available to scientists and the public. The material includes the astronauts’ observations of five faint flashes from impacts on the Moon, a rare record that could help researchers assess risks to future lunar habitats and infrastructure.

NASA’s new web page asks what the four astronauts saw, noticed and documented while travelling around the Moon. Through photographs, spoken observations, drawings and annotations, the crew assembled a scientific record that can now be studied further. NASA has described the collection as “Sights and Sounds of Science.”

As part of the mission’s science plan, lunar scientists had asked the crew to watch for tiny flashes created when rocky fragments struck the lunar surface. Astronauts reported five extremely faint, pinprick bursts of light from a distance of 46,000 miles. Some scientists were astonished by the sightings, which the science team confirmed after ruling out other possible sources, including cosmic rays and reflections from the spacecraft.

The flashes were observed during a planned communications blackout as the crew passed behind the Moon. The astronauts also experienced a total solar eclipse lasting nearly an hour while on the far side, creating dark conditions that made the subtle bursts easier to spot. Apollo astronauts had reported similar flashes from lunar orbit, but the Artemis II crew may have seen the faintest ones detected by the unaided eye.

Scientists estimated from the flashes’ brightness that the incoming rocks were each no more than a couple of inches wide. Despite their small size, they were moving at thousands of miles per hour and produced enough light on impact to be visible. Because the Moon has no atmosphere to slow or burn up incoming debris, such projectiles strike its surface freely.

The crew’s direct observations offer a rare dataset that could help scientists determine how often small impacts occur. Understanding their frequency is important to assessing long-term risks for lunar habitats and infrastructure planned for the future. Mission Control responded, “Amazing news,” after learning of the flashes. Space.com reported that when a Mission Control operator looked toward the Science Evaluation Room, “they were jumping up and down, literally.”

The astronauts also described subtle shades of grey, black, brown, tan, white, green and blue across the lunar surface. Those colours provide clues about the rocks and minerals in different regions and may help researchers reconstruct how the Moon, and by extension Earth, evolved over time.

NASA said this week that the data, including some material not previously released, has been uploaded to its Planetary Data System, the public archive for the agency’s planetary missions. The release contains more than 11,000 full-resolution images and videos of the Moon taken with the crew’s handheld cameras and cameras on the Orion spacecraft, as well as 8.5 hours of audio recordings of the crew’s scientific observations and images annotated by the astronauts.

NASA has also published the Artemis II Preliminary Lunar Science Report, the Artemis II Lunar Science Operations Report and the Artemis II Lunar Science Data User Guide alongside the data.