gary lawrence murphy garymcanadacom g gordon mohr writes g gary lawrence murphy writes 20000 years ago one size mt everest ever slightly grazed us left scar 400km long side south america g information incident g would find details web good question covered one amateur rags maybe sky telescope even scienterrific american long web speak youd think 400km gash earth would pretty easy find remember issue perhaps late 80s early 90s interesting note nt7 many neo bodies trajectories approach earth ecliptic earth tilt south america becomes pretty good target trying find site google turned several different impact sites venezuela brazil ages ranging 251m 70 years 400km gash story google refs found period one arizona famous impact crater another nm wish noted actual south american country contains scar venezuela sticks mind cant certain httpneojplnasagovimagesmeteorcraterhtml gary lawrence murphy teledynamics communications inc business innovations open source systems httpwwwteledyncom computers useless give answerspablo picasso httpxentcommailmanlistinfofork 26 jul 2002 010715 0400 asteroids anyone