Apollo 15 brought back green glass beads; decades later they revealed lunar water

In 1971, Apollo 15 astronauts David Scott and James Irwin noticed something unusual on the Moon: tiny green flecks scattered across the otherwise grey surface. They collected samples and brought them back to Earth, unaware that the material would decades later challenge a long-held belief about the Moon. According to Brown University, the green flecks were volcanic glass beads, and more than 35 years after the mission, researchers discovered evidence of water trapped in the volcanic glass. As per NASA, researchers studying Apollo samples in 2008 detected hydrogen in tiny volcanic-glass beads, providing evidence that water was present inside the Moon when the beads formed during ancient volcanic eruptions.A strange discoveryApollo 15 reached the Moon in July 1971 and was designed to be more than simply another lunar landing.