June 7, 2012 | Rohan

Though it’s no longer considered a planet, Pluto is still a strange world full of surprises… Astronomers recently spotted another moon around the dwarf planet. Pluto has one giant moon called Charon and three smaller moons barely larger than cities.

Because Pluto and Charon are so close, the other moons orbit the pair in much the same way as some planets orbit pairs of stars called ‘binary stars’. This should help planet-hunting astronomers to predict how alien worlds in far-off solar systems behave when orbiting more than one star.