Live Science on MSN
'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'
The only thing that could explain this tilt was a hidden world, they argued. "We started trying to come up with explanations ...
An international team of researchers has just revealed the existence of three Earth-sized planets in the binary stellar ...
The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...
Space.com on MSNOpinion
Strange 'puffy' alien world breaks every rule for how planets should behave
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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