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Danh ngôn của Kip Thorne (Sứ mệnh: 8)

Each black hole spins on its axis like the Earth spins. That spin creates two vortexes of twisting space, somewhat like vortexes in a bathtub or a whirlpool.
'Closed timelike curve' is the jargon for time travel. It means you go out, come back and meet yourself in the past.
A black hole really is an object with very rich structure, just like Earth has a rich structure of mountains, valleys, oceans, and so forth. Its warped space whirls around the central singularity like air in a tornado.