BBC Inside Science Should Pluto become a planet again?
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May 7, 2026 
Chris Lintott, astronomer and science communicator, debates Pluto’s planetary status. Professor Yossi Yovel, animal communication researcher, outlines a prize to decode animal signals. Roland Pease, science reporter, investigates an Alaskan landslide and tsunami. Penny Sarchet, New Scientist editor, rounds up overlooked research and social-science stories.
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Scientists Use Different Definitions Of Planet
- Planet classification differs by discipline: astronomers prioritise mass and orbit, while planetary scientists focus on geological activity and landscapes.
- Lintott stresses Pluto is geologically rich despite its dwarf status, so classification is semantic not scientific.
Pluto Debate Fueled By National Pride
- Public feelings and national pride shape the debate, with US commentators wanting Clyde Tombaugh's discovery honored as a planet.
- Tom Whipple and Chris Lintott note Americans see Pluto as 'their' planet and resent its removal after New Horizons completed the reconnaissance.
Why Now Is Right To Talk To Animals
- The Coller Doolittle Challenge exists because AI and huge animal datasets make decoding animal communication plausible now.
- Yossi Yovel says combining machine learning with vast recordings creates a timely chance to decode whistles, calls and meanings.