NASA @NASA
Mirror, mirror in the sky, Focus X-rays on the fly This odd-looking thing is a set of mirrors for an X-ray telescope. In this @tumblr post, we explain how it’ll help us study some of the hottest and most energetic parts of space, including black holes. https://t.co/ZmnRQ0aZKI https://t.co/IC0YsweLXU — PolitiTweet.org