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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'

Astronomers believe they have uncovered evidence of a previously unknown ninth planet lurking in the not-too-distant reaches of the solar system. This hypothetical world, dubbed "Planet Y," could be ...
KTVB

Mercury joins planet parade this week, marking rare 7-planet alignment

WASHINGTON — Stargazers will have a special chance to see seven planets align in the night sky this week as Mercury joins Venus, Mars, Jupiter, Saturn, Uranus and Neptune in a planetary parade. In ...
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A hidden world? Astronomers may have found a new solar system planet

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...
IFLScience

Forget Planet X! Beyond Neptune, There Might Be An Earth-Sized Planet Y

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...