In a few months, the orbit of a star deep in the core of the Milky Way will cause it to pass within 18.4 billion kilometers (11.4 billion miles) of the supermassive black hole at the center of the galaxy, Sagittarius A*. This event is of particular interest to physicists, as the plummeting star, S0-2, will speed up to 3 percent of the speed of light as it slingshots around its supermassive parent--a prime opportunity to test Einstein's Theory of General Relativity.
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