#Now in 2009, astronauts John Grunsfeld (SciAstro) & Drew Feustel (Astro_Feustel) install the Cosmic Origins Spectrograph, the most sensitive spectrograph ever flown on Hubble. #SM4live https://www.flickr.com/photos/nasahubble/33963974698/in/album-72157670398668456/
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