My point exactly (except that I have twice been pulled over by the Highway Patrol driving from Khon Kaen to Bangkok), they do not always have the budget for constant patrols.
Your only focus seems to be attacking other posters ad hominem when their opinions and facts disagree with your own.
Not that I can recall any post of yours which contained any facts.
'In the movies' the aim has never been to 'destroy' an oncoming asteroid but to 'reach it early' enough with a 'nuke of sorts' to deflect is trajectory to ensure it misses earth.
The reasoning seemed sound enough... i.e. a 0.15 degree deflection far enough out could be sufficient if the asteroid is 5 years out.
But also, not only a 'deflection' change would work, but also a 'momentum change' where a subtle
'slowing' impacts (delays) the orbit relative to earth.
Theoretically a 5-megaton nuclear explosion 1 year before impact would cause a deflection angle resulting in the asteroid missing Earth by approximately 6,450 km (according to AI).
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