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Neil deGrasse Tyson @neiltyson
Each year around this time, Earth plows through the debris-trail of Comet Swift-Tuttle. At our orbital speed of 67,000 mph (30km/s) the particles burn harmlessly in our atmosphere, rendered aglow as shooting stars. Behold the annual Perseid Meteor shower: https://t.co/XGapXfe9BU — PolitiTweet.org