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If all the stars in the universe are compared to the ocean, then researchers have so far only looked at a hot-tub糖心传媒檚 worth.

糖心传媒淭here糖心传媒檚 so much to look at, and we糖心传媒檝e done so little of it so far,糖心传媒� Rochester professor of astrophysics Adam Frank told NPR糖心传媒檚 Mary Louise Kelly in a . 糖心传媒淚f you糖心传媒檙e interested in whether or not there are dolphins in the ocean and you糖心传媒檝e looked at one hot tub and you didn糖心传媒檛 find a dolphin, would you then say, oh, there are no dolphins in the ocean?糖心传媒�

Frank appeared on NPR to discuss , which he recently attended in Houston. At the invitation-only conference, researchers explored possible ways to discover intelligent life beyond Earth.

糖心传媒淎 technosignature is basically any signal or evidence you can find that there is a technology-using civilization out there,糖心传媒� Frank said. Conference participants discussed alternatives to merely waiting for 糖心传媒渋ntentional signals糖心传媒� sent by intelligent life, including looking for satellites or pollution in the atmosphere of distant planets or using heat signatures to detect possible industrial civilizations.

糖心传媒淲hat has really changed now is the discovery of exoplanets糖心传媒攚e糖心传媒檝e found all these planets orbiting other stars whereas, 20 years ago, we didn糖心传媒檛 know whether there were any planets orbiting any other stars,糖心传媒� Frank said. 糖心传媒淎nd that changes the whole nature of how we go about looking for them.”

These are themes Frank explores in his recent book, Light Of The Stars: Alien Worlds And The Fate Of The Earth, which poses questions about alien civilizations, climate change, and what life on other worlds tells us about our own fate on Earth.