:: Google says that 1 megatonne TNT is 4.18400 ?1015 joules.
2.
The "'S3 "'was a French land-based Intermediate Range Ballistic Missile, equipped with a single 1.2-megatonne thermonuclear warhead.
3.
:: Now, admittedly, if the laser could be left running, continuously, for four second-then it would hypothetically produce a megatonne of energy and it could level entire cities.
4.
So a one megatonne nuke produces 4x10 15 joules of total energy, spread over however long it takes to explode . . . which is 10 9 times as much energy as the petawatt laser produces in a nanosecond.
5.
For instance, this formula implies that the expected value of the time from now until the next impact greater than 1 megatonne is 33 years, and that when it occurs, there is a 50 % chance that it will be above 2.4 megatonnes.
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