On June 22, 1633, astronomer Galileo Galilei recanted his belief in heliocentrism, the idea that the Earth revolves around the sun. He didn’t do this based on scientific research, but under pressure from the Holy Office in Rome.
Three hundred forty-five years later, to the date, American astronomer James W. Christy discovered Charon (pictured above), a moon for what was then called “the ninth planet,” Pluto. This put Christy in an august company of satellite discoverers, including Galileo, who had discovered four of Jupiter’s moons in 1610.
When Pluto was later “demoted” to “dwarf planet” status, in 2006, no one was put under house arrest for objecting, or for not changing his or her mind, as had Galileo been centuries before.
The ratio in sizes between Charon and Pluto make the pair, effectively, a “double dwarf planet.”