A planet is more than a spot in the sky.
Tuesday marked the 15th anniversary of a contentious redefinition in the skies, the “demotion” of Pluto from the ranks of planet to dwarf. Lisa Grossmanfor ScienceNews, and in the process tracked her own about-face on the question, from thinking a strict definition of “planet” was necessary to seeing the benefits of a more inclusive, expansive club. “One common argument in favor of the IAU’s definition is that it keeps the number of planets manageable,” she wrote.
Seeing Earth as an exoplanet helps us feel a little less lonely, imagining alien observers searching for us through their telescopes as we search for them, but some astronomers think we may have more planetary company around the sun than we realize.
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