One of many amazing images available from NASA’s website, this image shows a spiral structure that is over 60,000 light-years across. This sweep of cosmic beauty carries the engaging moniker NGC 5194 and shares space relatively near the handle of the Big Dipper.
This and many other images, videos, audio files and data files are free for non-commercial use in course materials, photo collections, web pages and so on. NASA simply requires that you list them as the source of the material. Exceptions and other conditions are listed on their Using NASA Imagery and Linking to NASA Web Sites page.
Image Credit: NASA, Hubble Heritage Team, (STScI/AURA), ESA, S. Beckwith (STScI). Additional Processing: Robert Gendler
via M51 Hubble Remix.