Sextants have helped sailors find their way across oceans for centuries. Now one is onboard the International Space Station so that astronauts can learn to find their way across the solar system even if other technologies fail. Reaching the ISS on the same supply mission was the Cold Atom Lab.  It may achieve the lowest temperatures in the universe, helping to unlock cosmic secrets.  Every naked eye planet is visible!  Bruce Betts will tell you where to look in What’s Up.  Learn more about all our topics and hear extended interviews:   http://www.planetary.org/multimedia/planetary-radio/show/2018/0711-2018-sextant-and-cold-atom-lab-on-iss.htmlLearn more about your ad choices. Visit megaphone.fm/adchoices

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