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"Make Pluto a planet again" was the call this week from Donald Trump’s NASA Administrator, Jared Isaacman. The icy body was first seen in 1930 and was the only planet whose discovery was claimed by the United States. In 2006, though, it was officially stripped of its planet status. Tom Whipple is joined by astronomer Chris Lintott to discuss the debate that has raged ever since over whether Pluto should or shouldn’t be reinstated as the solar system’s 9th planet. We also hear about the big money scientific prize hoping to lead to breakthroughs in how humans can communicate with animals. Head judge Professor Yossi Yovel, from Tel Aviv University, and finalists Dr Catherine Crockford, from the CNRS Institute for Cognitive Sciences in Lyon, and Professor Nicolas Mathevon, from the University of Saint-Etienne, tell us what the Coller Dolittle Challenge is hoping to uncover. Plus, Penny Sarchet from New Scientist brings us the science news that might have slipped under the radar this week, including why there’s a scientific gap in the dating lives of over 50s. Presenter: Tom Whipple Producer: Alex Mansfield Editor: Ilan Goodman Production Co-ordinator: Jana Bennett-Holesworth