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Planetary science

Planetary science

Earth-sized planet could be lurking at the edge of the solar system, simulations suggest

14 Sep 2023
Sedna illustration
Strange motion: the minor planet Sedna – shown in this artist’s impression – was one of the TNOs studied by Lykawka and Ito. (Courtesy: NASA/JPL-Caltech/R. Hurt (SSC-Caltech))
A hidden planet with a mass about 1.5–3 times that of Earth could be lurking at the edge of the s

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Rob Lea is a science writer based in the UK
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