After all they're still planets and moons, with one exception they're outside our solar system. We don't call stars in other galaxies "exostars" then? Their discovery shouldn't be a big surprise either, it should be totally normal for planets to form around other stars and for moons to form around those planets.
Submitted November 21, 2018 at 10:49AM by TerraformerofMars https://ift.tt/2DAujst
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