WASHINGTON, USA, April 12, 2026 - NASA published 800 gigabytes of Artemis II lunar science data to the Planetary Data System on 12 April 2026.^[1] Alongside the raw dataset, NASA released three formal supporting documents: the Artemis II Preliminary Lunar Science Report, the Artemis II Lunar Science Operations Report, and the Artemis II Lunar Science Data User Guide.^[2] Included within the dataset are 8.5 hours of audio recordings capturing the crew's live scientific observations of the lunar surface during the mission.^[3] An initial preliminary summary report titled 'Artemis II: Sights & Sounds of Science' was first issued on 1 April 2026, following completion of the mission.^[4] During the flight, the crew witnessed a 54 minute total solar eclipse, providing unobstructed observations of the Sun's corona and space weather.^[5] NASA scientists plan to compare the crew's handheld camera observations against data collected by the Lunar Reconnaissance Orbiter, as part of work to understand lunar geological evolution.^[6] Impact Insight. NASA's Planetary Data System is the public archive where mission data are kept so that any scientist can use them for decades. The link to planetary defense is indirect: the same archive holds NASA's observations of asteroids and comets, and open data lets researchers worldwide check and build on them.