One of astronomy's grandest riddles may have just gotten even more interesting, according to new research that suggests the source of a mysterious signal that some dubbed an "alien broadcast" may ...

The string of letters was unmistakable — an anomaly, perhaps even a message from an alien civilization ... in the margin: ...

When the data was analyzed later, an astronomer’s marginal exclamation of the extraordinarily powerful but vanishingly brief blip would give the signal its forever name: the Wow! Signal.