Astronomers using ESA’s X-ray observatory, XMM-Newton, have discovered a pair of X-ray tails, stretching 3 million million kilometres across the sky. They emanate from the mysterious neutron star known as Geminga. The discovery gives astronomers new insight into the extraordinary conditions around the neutron star.
More information at:
http://www.esa.int/export/esaCP/SEMQB4YO4HD_Expanding_0.html