Apollo 15 astronauts collected tiny green glass beads from the Moon in 1971; more than 35 years later scientists found evidence of water inside, changing what we knew about the lunar interior
When scientists announced Webb’s first definitive detection of Neptune’s auroras in March 2025, they revealed another surprise: observations taken in 2023 showed that the planet’s upper atmosphere had cooled by several hundred degrees since Voyager 2 visited in 1989—and scientists still don’t know exactly why.