NASA's Fermi Gamma-ray Space Telescope has found a signal at the center of the neighboring Andromeda Galaxy that could indicate the presence of the mysterious stuff known as dark matter. The gamma-ray signal is similar to one seen by Fermi at the center of our own Milky Way galaxy. The gamma-ray excess (shown in yellow-white) at the heart of M31 hints at unexpected goings-on in the galaxy's central  region. Scientists think the...

[[ This is a content summary only. Visit my website for full links, other content, and more! ]]