owynabderus at KillBaitAstronomers Propose a New Hypothetical Earth-Sized Planet in the Solar System
A recent study has proposed the existence of a hypothetical planet called 'Planet Y,' which could be smaller and closer to Earth than the previously theorized Planet Nine, also known as Planet X. Planet Y is believed to be roughly the size of Earth, or somewhere between Mercury and Earth in mass, an... [More info]
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