High-energy Cosmic Rays …

… a Sign of Dark Matter or a Nearby Quasar?

There is a really interesting article over on Ars Technica about a
high-alitiude baloon flight in Antarctica has turned up very surprisng
results.  Both of the main explanations are fascinating:

The straightforward explanation requires an unidentified astrophysical
object spitting out high-energy electrons in our neighborhood. The more
exotic solution suggests that dark matter particles enabled by the
existence of extra dimensions may be annihilating nearby. Either of these
options seems pretty exciting.

http://arstechnica.com/news.ars/post/20081119-faster-than-the-speed-of-dark-annihilations-above-antarctica.html

Thanks Mark!