Sedna

"In the outer reaches of our solar system, far beyond the orbit of Pluto, lies Sedna, one of the most mysterious objects ever discovered."https://phys-org.cdn.ampproject.org/v/s/phys.org/news/2025-06-propulsion-enable-mission-sedna.amp?amp_gsa=1&amp_js_v=a9&usqp=mq331AQGsAEggAID#amp_tf=From%20%251%24s&aoh=17511392160985&csi=0&referrer=https%3A%2F%2Fwww.google.com&ampshare=https%3A%2F%2Fphys.org%2Fnews%2F2025-06-propulsion-enable-mission-sedna.html