Something on Pluto and one of Saturn’s moons, Titan, absorbs light in a way unexplained by anything in spectroscopic databases.

Whatever it is, it's nothing registered in our chemical database, researchers say.

Something on Pluto and one of Saturn’s moons, Titan, absorbs light in a way unexplained by anything in spectroscopic databases.

Two worlds at almost opposite ends of the Solar System have just given us a mystery we didn't even know existed.