Signs In The Heavens -- Giant comet to pass Mars for the first time in a million years

Giant comet to pass Mars for the first time in a million years , A comet on a once-in-a-million-years journey will graze the atmosphere of Mars, astronomically speaking, this Sunday. This historic game of cosmic chicken on October 19 will be documented by more than a dozen spacecraft, including Mars orbiters in the neighborhood that must then "duck and cover" behind the Red Planet to avoid damage from the comet's coma of debris.