Long invisible to astronomers, the newly-discovered molecular cloud is one of the largest single structures in the sky and among the closest to the Sun and Earth ever to be detected. The Eos cloud sits on the edge of the Local Bubble, a large gas-filled cavity in space that encompasses the Solar System. Image credit: Thomas Müller, HdA & MPIA / Thavisha Dharmawardena, NYU. Molecular clouds are composed of gas and dust — with the most common...
