As much as I enjoyed Deep Impact as a movie, it probably did a lot to mislead people. The scientific inaccuracies were rampant but less obvious to the layman than perhaps a more action oriented film like Armageddon. I see the same mistaken assumptions made by people all the time now, everything from massive thick jets of dense material coming from comets to the notion that an astronaut would be instantly blinded by the sun if his visor was up for any length of time.