On July 14, 2015, after a voyage of nearly 10 years and more than 3 billion miles, NASA’s New Horizons spacecraft flew within 7,800 miles (12,550 km) of Pluto. … In the five years since that groundbreaking flyby, nearly every conjecture about Pluto being an inert ball of ice has been thrown out the window.
https://earthsky.org/space/new-horizons-flyby-10-cool-things-about-pluto#:~:text=On%20July%2014%2C%202015%2C%20after,(12%2C550%20km)%20of%20Pluto.&text=In%20the%20five%20years%20since,been%20thrown%20out%20the%20window.
