Pluto was famously demoted as a planet after the introduction of a new classification system, but the row over what counts as a planet has continued as astronomers try to wrestle with the 5000 known exoplanets.
? Despite decades of trying, astronomers still haven’t found a definition that everyone can agree on – and the problem only gets harder when considering worlds outside our solar system. The latest attempt to define an exoplanet has sparked fresh controversy.
The International Astronomical Union , arbiter of all things cosmic, set out a final definition for planets in our solar system in 2006,Subscribe now for unlimited access
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