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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 ...

Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago.

Planet Nine, according to Batygin, is a “super-Earth” object, about five to seven times the mass of our planet, and its orbital period is between 10,000 and 20,000 years.