How Much Energy Would It Take to Blow the Earth to Smithereens?
Briefly

If you wanted to pulverize it completely so that nothing remained, you would have to use the following formula: EG = 3GM25R.
The formula applies to a homogeneous sphere. Although Earth is not a perfect homogeneous sphere, the equation suffices to at least calculate the correct order of magnitude of its binding energy.
Read at www.scientificamerican.com
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