When NASA’s New Horizons mission flew past Pluto in 2015, it gave humanity our first glimpse of a colossal depression on the isolated world. It's named Sputnik Planitia. Comparable in size to ...
Artistic representation of the huge and slow impact on Pluto that led to the heart-shaped Sputnik ... [+] Planitia structure on its surface. Ever since NASA's New Horizons sent back the first-ever ...
Famously, Pluto no longer met the criteria and was demoted ... that its own self-gravity pulls it into a nearly spherical shape. The dynamists countered that a planet should be anything that ...