Eruption of enormous flare from exploded supernova baffles Nasa scientists

An enormous flare which erupted from the remnants of an exploded star in a faraway constellation has left Nasa scientists baffled. Last month, the famous Crab Nebula supernova, first observed in 1731, gave off a flare five times more powerful than any previously seen from the object. On April 12, Nasa's Fermi Gamma-ray Space Telescope first detected the outburst, which lasted six days. It is located 6,500 light-years away in the constellation Taurus. At the heart of an expanding gas cloud lies what is left of the original star's core, a superdense neutron star that spins 30 times a second.  With each rotation, the star swings intense beams of radiation toward Earth, creating the pulsed emission characteristic of spinning neutron stars, known as pulsars. Apart from these pulses, astrophysicists believed the Crab Nebula was a virtually constant source of high-energy radiation.   link