[Fido969]

It's possible that the bursts are produced by intelligent extraterrestrials, perhaps to blast space-sailing craft through the cosmos at incredible speeds,

Scoff if you like, but, you know, if those extra-terrestrials were travelling at the speed of light, they'd be getting here just now.

[LibWhacker]

And they weren’t able to stop along the way and grab a bite to eat, so they’re really, really hungry!