planets

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Astronomers investigating the odd alignment of rocks beyond Pluto concluded that an undetected icy planet four times the size of Earth must exist Astronomer, Solar System, Icy, Alignment, Exist, Investigations, Discovery, Planets, Rocks
Evidence suggests huge ninth planet exists past Pluto at solar system's edge
Astronomers investigating the odd alignment of rocks beyond Pluto concluded that an undetected icy planet four times the size of Earth must exist