Fly about 2,600 light-years to Hubble Space Telescope imagery of the Cygnus loop nebula. See images from 2001 and 2020.

New maps reveal a vast store of hidden star-making material called "CO-dark molecular gas," found in the Cygnus X region.

Stars like our Sun turn into red giants as they run out of hydrogen to fuse at their core. As the star continues to age, it will blow out its outer layers until the only thing that remains is an ...