Unequal jets gave the neutron star of Cassiopeia A its kick
At the center of the supernova remnant Cassiopeia A, a neutron star races along at 400 kilometers per second. In a single second it covers the distance from Moscow to St. Petersburg. Where does that acceleration come from? A new study shows that the star was pushed by two shots from a cosmic cannon, and one of them was forty times more powerful than the other.