Is there a giant planet hiding in the outer solar system?
Some astronomers think so. Since 2016, evidence has been building for a massive body pulling at distant icy objects, distorting their orbits. They’ve been calling it “Planet Nine.”
But maybe it’s time we gave it a real name: Pius—Latin for dutiful, pure, reserved. Because this planet (if it’s out there) is a master of quiet influence.
Here’s what we think we know:
• Size: 5–10x Earth’s mass
• Orbit: 400–800 AU, takes 10,000+ years to go around once
• Type: Likely an ice giant or mini-Neptune
• Status: Still unconfirmed, but sky surveys are closing in
Unlike Pluto, Pius would easily qualify as a planet under today’s rules: it’s big, round, orbits the Sun, and clears its orbital zone.
Why “Pius”? Because it fits:
• Hidden yet powerful
• Reserved but influential
• The kind of planet that shapes the outer solar system without ever showing off.
The hunt continues. And if we find it—let’s call it what it is: Pius, the true Ninth Planet.
