[forgotpwd16]

>If it’s pulsars that are truly generating the positrons that could be responsible for the signal that cosmic ray experiments are seeing [...]

>Whenever there’s an unexplained phenomenon that we’ve measured or observed, it presents a tantalizing possibility to scientists: that perhaps there’s something new at play beyond what’s presently known.

(Is it me or this paragraph that sentence is taken from has a strange flow in it?)

>However, we cannot claim evidence for a new discovery until we first scrupulously and quantitatively account for everything that represents the physics and astrophysics of what’s already known.

The source doesn't show it as definitive.