Astronomers believe they may have found a brand new planetary neighbor in our own solar system — Planet Y. Though we haven’t directly seen it yet, its gravitational effects suggest something massive is lurking far beyond Neptune. Could this be the long-theorized Planet Nine — or something entirely new?

In this video, we break down what scientists have found, why they think Planet Y exists, and what it could mean for our understanding of the solar system. Don’t miss this cosmic mystery unfolding in real-time.

Astronomers Propose 'Planet Y' as a Hidden Planet 

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Astronomers Propose 'Planet Y' as a Hidden Planet