The Crab Nebula
The Crab Nebula is the result of a supernova and was observed from Earth in 1054. At its core lies a rotating neutron star or 'pulsar' - view it in stereo and you will see the pulsar is at the nebula's heart with faint ripples emanating from it. Though this is my interpretation, astronomers have in fact imaged wisps of material moving away from the pulsar at half the speed of light! - click here for more information.