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NASA astronaut and asteroid-hunter Edward Lu explains why we urgently need to map all sizeable Near-Earth orbit asteroids if we want to avoid becoming 'dinosaur toast'. Lisa Randall, a theoretical physicist at Harvard, explores the mysteries of dark matter, the invisible, seemingly inert stuff which is thought to account for over a quarter of all mass-energy in the universe. And Fermilab's Craig Hogan is behind a new experiment to probe the fabric of space itself, by seeing if it's possible to detect the very tiniest units in the universe. Photos © All rights reserved by aspeninstitute-internal
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