Image courtesy of Peter Jurik/Alamy
Joel Kontinen
Are there
unseen planets in our solar system?
"Somewhere at the edge of the solar system a new Earth-sized
world might be lurking, dubbed Planet Y.
Astronomers have long proposed that there might be hidden planets beyond the Kuiper belt, a region of icy objects that is home to Pluto. Some of the more famous suggestions
include Planet X, a hypothesised world about seven times the mass of Earth
orbiting around 50 times the Earth-sun distance – now mostly debunked –
and Planet Nine, which would be 10 times the mass of Earth and at least
300 times further from the sun than our planet and which remains a promising
possibility."
Source:
Jonathan O’Callaghan 2025 There might be a 'Planet Y' hiding in the outer solar system | New Scientist 21 August
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