In 1978, astronomer James Christy noticed something unusual in this image of Pluto. It would lead Christy and his team to the discovery of Charon, one of Pluto's moons. Credit: NASA
In 1978, astronomer James Christy noticed something unusual in this image of Pluto. It would lead Christy and his team to the discovery of Charon, one of Pluto's moons. Credit: NASA