John Timmer on the discovery of what maybe the oldest planets in the universe. Read more at Ars Technica
Five of them, all smaller than Earth, indicate planet formation started early.
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Gaps suggest that planet formation has kicked off in less than a million years.
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Over 500,000 unidentified objects in the sky to choose from.
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A newly analyzed Kuiper belt object is posing a challenge to planet-formation theories
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