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Astrum. Why some astronomers believe Planet 9 is real. Posted: February 14, 2025 | Last updated: March 8, 2025. For decades, we believed there were nine planets in our solar system—until Pluto ...

When most of us left school there were still 9 planets – but we’ve come a long way since Pluto’s demotion. Here’s what’s next on the space agenda.