Pluto is an icy dwarf planet that usually lies beyond the orbit of Neptune in the Kuiper Belt. 
The dwarf planet is smaller than Earth’s Moon, with red snow-capped mountains as tall as the Rockies. 
NASA’s New Horizons spacecraft made its historic flight through the Pluto system in 2015, providing the first close-up images of the planet

Source: Hot Hardware – It’s Pluto Day 2023: A Wonderful Look At This Complex World Of Ice Mountains