Pets

What is a planet? Astronomers can’t agree on a definition

In 2006, the International Astronomical Union got here up with a brand new solution to classify planets that famously noticed Pluto downgraded. Now a brand new row has began as astronomers attempt to outline exoplanets



Space



25 March 2022

Exoplanet

An artist’s impression of a Jupiter-like exoplanet

Shutterstock/Artsiom P

What is a planet? Despite many years of making an attempt, astronomers nonetheless haven’t discovered a definition that everybody can agree on – and the issue solely will get tougher when contemplating worlds outdoors our photo voltaic system. The newest try and outline an exoplanet has sparked contemporary controversy.

The International Astronomical Union (IAU), arbiter of all issues cosmic, set out a remaining definition for planets in our photo voltaic system in 2006, famously demoting Pluto to a dwarf planet within the course of. Its first requirement is {that a} …

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