Mass and length may not be fundamental properties of nature, according to new ideas bubbling out of the multiverse. Though galaxies look larger than atoms and elephants appear to outweigh ants, some physicists have begun to suspect that size differences are illusory. Perhaps the fundamental description of the universe does not include the concepts of "mass" and "length," implying that at its core,
Back when you dreamed about being an astronaut, you imagined floating in space, looking back at Earth, and it sounded amazing. Not so much if you’re not attached to a station or a ship and have no way to get back home. That’s the situation writer-director Alfonso Cuarón created for Sandra Bullock and George Clooney in October’s Gravity.
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