Artemis II sightings of meteor flashes could inform lunar safety planning

During an April 6 flyby the Artemis II crew reported several millisecond flashes on the lunar far side that mission scientists described as meteorite impacts; researchers plan to combine those observations with orbital data and future seismometer measurements to refine impact rates and assess risks to lunar infrastructure.

The Artemis II crew observed multiple brief flashes on the lunar far side during their April 6 flyby, reporting the events to mission control. Scientists on Earth described the flashes as meteorite impacts seen against the dark far side during a near-hour eclipse. These observations are being treated as time-stamped impact events that can be compared with orbital data and seismic records. Researchers say such data can help improve understanding of how often impacts occur and what risks they might pose to long-term lunar infrastructure and crews. Key observations: - The crew reported at least four millisecond-long flashes on April 6, and mission radio suggested there may have been as many as six. - Mission control said scientists reacted audibly as the reports arrived and confirmed the flashes were interpreted as impact events. - Teams plan to match astronaut sightings with data from the Lunar Reconnaissance Orbiter to measure flash brightness, estimate meteoroid masses, and check for new craters. - No active seismometers currently operate on the moon; Apollo-era instruments recorded about 1,700 impact-related moonquakes, some strong enough to move boulders or alter slopes. - NASA has plans for early robotic missions and seismometer deployments ahead of crewed landings planned for 2028 and beyond to improve monitoring. Summary: The Artemis II observations supply new, time-stamped impact events that scientists can combine with orbital imagery and eventual seismometer data to better estimate impact frequency and energy. Planned robotic deployments and seismometer installations tied to future Artemis landed missions are expected to provide additional measurements that will help locate impacts and evaluate potential effects on lunar infrastructure and habitats.