Letter: Put planet discovery in the proper context | INFORUM

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Letter: Put planet discovery in the proper context

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Astronomers announced in an American Astronomical Society meeting that they have discovered a new planet. That’s not new because there are other so-called planets out there. But this gets tricky when you try to define “planet.” We didn’t have a concrete definition for what a planet is until the mid-2000s. But still there is discussion and debate on that issue of definition.


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