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Planet busters: We asked a physicist what it would take to obliterate Earth – Digital Trends
The planet-busting nuclear bomb is a classic science fiction trope. But is it really possible to build a nuke big enough to obliterate the globe?

Chris DeGraw / Digital Trends
One of science fiction’s most classic tropes is the dastardly plan to destroy the planet with a massive, world-ending bomb. You’ve almost certainly seen it before. The trope has made appearances in some of the world’s most beloved movie franchises, from Mission Impossible to Planet of the Apes. Sometimes the bomb in question will end all life on Earth, but in other cases, it’s powerful enough to blow the entire planet to smithereens.
The sheer ubiquity of this trope…
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