Exoplanets

Why we need a new definition of the word 'planet'

Why we need a new definition of the word 'planet'

Is it time for a new definition of “planet”?

UCLA astronomer and planetary scientist Jean-Luc Margot says the answer is yes.

The current definition was decreed by the International Astronomical Union just nine years ago. The problem is, it applies to only bodies within our solar system.

Margot proposes solving this problem with a new, simpler definition that would apply to the thousands of known worlds that orbit stars other than the sun. More of these so-called exoplanets are being found...

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