We thought we understood planets, but the planetary disk chemistry of far-away XUE 10 is completely changing our conception ...
A low-density, puffy planet orbiting relatively far from a young star in a nearly perpendicular orbit. What's going on?
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'Planet Y' theory hints at hidden Earth-size world lurking in the solar system — and it could be much closer to us than 'Planet Nine'
A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...
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Which planets are the youngest and oldest in our solar system?
There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?
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