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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 ...

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million years. Uranus and Neptune were next, within 10 million years.