How many times the crab pulsar rotates per second, 406, 698, 718, 800+, what is the largest black hole, Phoenix A, ton 618, how are ultra massive black holes formed , a star exploding , neutron stars colliding , nebulas colliding , blackholes merging, what happens after a star explodes , Gamma ray burst , super nova, a black hole forms, nebula is formed , aliens might exist..., true, false, no evidence , none of these.

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