Moon Rocks' Radioactive Iron Suggests Supernova Blasted Earth

Radioactive iron in moon rocks collected by astronauts on NASA's Apollo missions suggests that a nearby supernova blasted Earth a few million years ago, according to a new study. This finding supports the idea that nearby stellar explosions may have influenced life on Earth, including the evolution of humans, the researchers said. Previous research found that supernovas generate huge amounts of a mildly radioactive variety of iron known as iron-60, which these cataclysmic explosions spew out int