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Scientists in the United States have warned that measures need to be taken NOW to prepare for a possible asteroid strike on Earth. And to avoid a catastrophe similar to the one thought to have wiped out the dinosaurs 60 millions years ago, the scientists are looking at an asteroid-blasting spacecraft. Dr Cathy Plesko is a research scientist at Los Alamos National Laboratory. (Photo: An artist's impression of meteorite fall and fireball. Credit: Press Association)