Astronomers have discovered a new dwarf planet in the Kuiper Belt, a vast ring of icy debris that is encircling the outer rim of our Solar System just beyond the gas giant Neptune. Discovery image of 2015 RR245. Image credit: OSSOS Team. The newfound dwarf planet, named 2015 RR245, is approximately 435 miles (700 km) in size, making it the 18th largest in the Kuiper Belt. The orbit of 2015 RR245 takes it more than 120 times further from the Sun than...