The validity of this end to our times is credited to Stephen Hawking and Roger Penrose. A black hole is a region of space that has so much mass concentrated in it that nothing can escape its gravitational pull, not even light. If someone were to fall into a black hole they would be shredded to pieces, or as Neil deGrasse Tyson, director of the Hayden Planetarium at the American Museum of Natural History wrote, "the most spectacular way to die in space". The most frightening fact is that the galaxy is full of collapsing stars waiting to turn into black holes, estimated close to 10 million. Although black holes are currently orbiting other astronomical masses, they are nearly impossible to see. It would not take very much space for a black hole to come close to earth and wreak havoc. If this day of doom did arise, it would be noticeable. Our climate would change drastically and our planetary alignments would be in a complete disarray.
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