Happy Astronomy Day, October 13, 2018!  We salute humankind’s long history of stargazing by checking in on what will be our planet’s largest telescope. Patrick McCarthy is an astronomer and a leader of the Giant Magellan Telescope project. He returns with a report on the instrument’s status, followed by a fascinating tour of the GMT facility. The MASCOT spacecraft has successfully completed its brief mission at asteroid Ryugu. Emily Lakdawalla provides an overview. And the space trivia contest has returned to What’s Up. See pics of our GMT visit and learn much more at: http://www.planetary.org/multimedia/planetary-radio/show/2018/1010-2018-patrick-mccarthy-gmt.htmlLearn more about your ad choices. Visit megaphone.fm/adchoices

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