Makemake is a dwarf planet in the outer solar system. It was the fourth body identified as a dwarf planet, and was one of the bodies that caused Pluto to lose its status as a planet.
Makemake is large enough and bright enough to be studied by a high-end amateur telescope. Astronomers took advantage of the dwarf planet's recent passage in front of a star — called an occultation — to determine that Makemake has no atmosphere.
It has a moon, though. In 2015, astronomers using NASA's Hubble Space Telescope discovered a tiny object orbiting Makemake.