Pluto's moon Charon is pretty weird, but its north pole — nicknamed Mordor Macula — may be the strangest place on it. It's stained blood red! And now, scientists have an idea why: Pluto is leaking onto it.
A group of astronomers is proposing a new definition of what a "planet" is, which would now include Pluto ... as well as a hundred other solar system objects. This is a definition we want, but is it a definition we need?
It took more than a few years, but when NASA’s New Horizons spacecraft finally sent back some of the first high-quality pictures ever captured of Pluto’s moon Charon, it brought just as many questions as answers.