'It's huge and it's been hidden all this time': The giant glowing cloud 'Eos' is one of the largest formations in the sky and we've never seen it before

The Eos molecular cloud is one of the most impressive structures in the sky on our planet. (Photo credit: Thomas Muller (HdA/MPIA) and Tavisha Dharmawardena (NYU)) Astronomers have discovered the closest known molecular cloud to Earth, giving them a unique…