The Royal Mint of the United Kingdom has released a commemorative coin honoring the late physicist Stephen Hawking, and featuring one of his favorite subjects — black holes.
The new 50-pence (66 cents) coin features Hawking's name spread over a field of concentric, circular lines representing a black hole. Cleverly, the surface of the coin appears to indent inward at the black hole's center (but is actually a 2D image).
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This equation helped lead Hawking to one of his most celebrated discoveries: the idea that, even as black holes vacuum...