Possible worlds and other essays 1928

And last, one implication of black holes as gateways is time travel. Because of relativity, there's no such thing as "now" that applies everywhere in the universe. "Instant" travel from point A to point B anywhere in the universe would also involve time travel, and you could end up arriving somewhere before you left. Physicist Stephen Hawking noted that since no one sees time travelers today (at least that's been reported) it seems unlikely that time travel is even possible in our universe; that would point to black holes being less useful as wormhole generators.

Possible worlds and other essays 1928

possible worlds and other essays 1928

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possible worlds and other essays 1928possible worlds and other essays 1928possible worlds and other essays 1928possible worlds and other essays 1928