How big is Makemake? How was it discovered?

On March 31, 2005, a group led by Michael E. Brown and his colleagues at the Palomar Observatory made the discovery of Makemake.

About two-thirds the size of Pluto, Makemake is the third-largest known dwarf planet in the Solar System. It was found on March 31, 2005, by a team led by astronomer Michael E. Brown using Hubble Space Telescope images.

Makemake is a dwarf planet located in the outer region of our solar system, specifically within the Kuiper Belt. It has a diameter of approximately 1,434 kilometers (891 miles), making it the third-largest known dwarf planet after Pluto and Eris.

Makemake was discovered on March 31, 2005, by a team of astronomers led by Michael E. Brown, Chad Trujillo, and David Rabinowitz. They used images captured by the Palomar Observatory's 1.2-meter Schmidt telescope to identify Makemake as a large and distant object orbiting the Sun beyond the orbit of Neptune. Its discovery was officially announced on July 29, 2005.