Fly about 2,600 light-years to Hubble Space Telescope imagery of the Cygnus loop nebula. See images from 2001 and 2020. br br Credit: NASA, ESA, STScIbr Acknowledgments:br NSF's NOIRLab, Akira Fujii , Jeff Hester , Davide De Martin , Travis A. Rector , Ravi Sankrit (STScI), DSSbr Edited by Space.