Astronomers have discovered Eos, a massive, crescent-shaped molecular cloud only 300 light-years from Earth, making it the closest known cloud of its kind. Unlike most molecular clouds, Eos contains little carbon monoxide, which is typically used to detect such formations. Instead, it was found by tracking the faint glow of hydrogen. Shaped by cosmic radiation, the cloud offers insight into the raw materials behind star and planet formation. Scientists believe more hidden clouds like Eos await discovery.
