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In the original Star Wars trilogy, the Death Star destroyed the planet of Alderaan, in one of the most pivotal events in the entire storyline. Sci-fi elements aside, could this ever really happen. How much energy would it actually take to destroy a planet? Surprisingly (or maybe unsurprisingly?), there's a good amount of research about this very question. Director George Lucas has said that Alderaan was roughly the size of Earth. With that in mind, a team from the University of Leicester calculated that it would require 2 octillion joules to break apart Earth. To put that number in perspective, the current world energy consumption is a mere 56 billion joules. Put another way, the required energy to destroy an Earth-like planet is 5.2 luminosities, which is equivalent to the amount of energy emitted by our sun in a week. Wow. Still, as Trace explains here, the idea is not completely impossible, in theory. It's really pretty fun to think about, actually.
Could a 'Death Star' Really Destroy a Planet? (Universe Today)
"Countless Sci-Fi fans vividly remember the famous scene in Star Wars in which the Death Star obliterates the planet Alderaan. Could a small moon-sized battle station generate enough energy to destroy an Earth-sized planet?"