I just wanted to know how much power does a missile need to destroy a 100 km³ meteorite heading for Earth.

Assume whatever meteorite composition is easiest to destroy, and intercept the meteorite at whatever point in its trajectory to keep Earth safe.

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    $\begingroup$ Welcome to the site Mega. Your question needs to provide a little more information to be answerable. Primarily we don't know the composition of your meteorite. One of the best pieces of advice I can give you being new to the site...when asking questions, be specific , make sure there is criteria that allow people to look at your question and know there is a right or at least best answer. Also, check out the help center it has some good info too. $\endgroup$ – James Apr 25 '17 at 14:13
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    $\begingroup$ Also to CLOSE VOTERS destroying/attempting to destroy the world is 1000*On-Topic. $\endgroup$ – James Apr 25 '17 at 14:15
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    $\begingroup$ You really can't destroy it. Trying to do so would break it into pieces, many of which would still hit Earth. Your best bet is to deflect it. The power needed would depend on how long in advance you apply it. If you have years, probably not much at all. Kerbal space program or something similar might be able to give you real numbers. $\endgroup$ – jamesqf Apr 25 '17 at 17:32
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    $\begingroup$ "Too broad"? People here are being very nit-picky about all the information that they "need." It might be nice to know what the meteor is made of, but most people do not know or care about the possible differences, and a good answer would just figure both the best case and worst case to provide a range. A very, very, very large portion of questions asked on World-Building are not nearly as specific as this question and still enjoy plenty of up-votes and thorough answers. $\endgroup$ – Loduwijk Apr 25 '17 at 18:11
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    $\begingroup$ @James no one voted off-topic, right? Seems all voted too broad. And seeing how many interpretations of destroyed appear in the comments, that's one of two fitting close reasons. Unclear would be valid as well. $\endgroup$ – Mołot Apr 25 '17 at 21:32