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International Asteroid Day

Are asteroids humanity’s ‘greatest challenge’?

PARIS: The United Nations has declared June 30 (today) International Asteroid Day to raise public awareness about what event organisers describe as "humanity's greatest challenge". Throughout its 4.5-billion-year history, Earth has been repeatedly pummelled by space rocks that have caused anything from an innocuous splash in the ocean to species annihilation. When the next big impact will be, nobody knows. But the pressure is on to predict -- and intercept -- its arrival. "Sooner or later we will get... a minor or…