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'
A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...
Chip Chick on MSN
New Evidence Of Another Planet Was Uncovered, And It Could Be Around The Same Size As Earth
For almost a decade, astronomers have been searching for a ninth planet in the solar system. Recently, new evidence of ...
A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...
On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...
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