Fastest Approaching Object

In general the universe is expanding. We can see it from the redshift of the light from distant galaxies. We sometimes can see periodic blueshifts as stars orbit each other. We can also see some blueshift by gravitational pulls from more massive stars or black holes. Researchers observed an object with blueshift of 1026 kilometers per second. The object observed is from galaxy M87 which has a significantly more massive black hole then the one in the Milky Way. Stars can be shot away from black holes when it's binary partner gets absorbed and to conserve momentum the remaining star gains significant velocity and shots off.


http://www.scientificamerican.com/article/found-the-fastest-approaching-object-in-the-universe/