Planet on Outer reaches

"Is there a massive undiscovered planet on the outer reaches of the solar system?"https://phys-org.cdn.ampproject.org/v/s/phys.org/news/2025-07-planet-massive-edge-solar.amp?amp_gsa=1&amp_js_v=a9&usqp=mq331AQGsAEggAID#amp_tf=From%20%251%24s&aoh=17538960386716&csi=0&referrer=https%3A%2F%2Fwww.google.com&ampshare=https%3A%2F%2Fphys.org%2Fnews%2F2025-07-planet-massive-edge-solar.html