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b'The stars are out tonight. And they do more than just twinkle. These boiling balls of hot plasma can tell us something about other celestial phenomena. They betray the hiding places of black holes, for one. But they can also fool us. Find out why one of the most intriguing discoveries in astrobiology \\u2013 that of the potentially habitable exoplanet Gliese 581g \\u2013 may have been just a mirage.\\nPlus, the highest levels of ultraviolet light ever mentioned on Earth\\u2019s surface puzzles scientists: is it a fluke of nature, or something manmade?\\nAnd a physicist suggests that stars could be used by advanced aliens to send hailing signals deep into space.\\nGuests:\\n\\n\\nPaul Robertson \\u2013 Postdoctoral fellow, Penn State Center for Exoplanets and Habitable Worlds\\n\\n\\nMike Joner \\u2013 Research professor of astronomy at Brigham Young University\\n\\n\\nNathalie Cabrol \\u2013 Planetary scientist, SETI Institute\\n\\n\\nAnthony Zee \\u2013 Theoretical physicist at the Kavli Institute for Theoretical Physics at the University of California, Santa Barbara\\n\\nFirst aired July 23, 2014.\\nLearn more about your ad choices. Visit megaphone.fm/adchoices'