The most massive star observed (so far) is 100 million times heavier than Earth and has the unremarkable name of R136a1. It's found in the equally impressive but better-named Tarantula Nebula (aka 30 Doradus or NGC 2070). Professor Paul Crowther is based at the University of Sheffield. Image contributors include Paul Haese - http://paulhaese.net/ - and others listed at http://www.deepskyvideos.com/pages/image_contributors.html - check out their work! Deep Sky Videos website: http://www.deepskyvideos.com/ Twitter: https://twitter.com/#!/DeepSkyVideos Facebook: http://www.facebook.com/DeepSkyVideos Flickr: http://www.flickr.com/photos/68847473@N02/ More about the astronomers in our videos: http://www.deepskyvideos.com/pages/contributors.html Videos by Brady Haran Video editing by Stephen Slater