2017: The Dawn of The Next Space Race Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Located in our galaxy about 5,500 light years from Earth, NGC 6357 is actually a "cluster of clusters," containing at least three clusters of young stars, including many hot, massive, luminous stars. ( NASA / flickr-creativecommons ) Produced by John Asante Produced by PRI and WNYC