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http://www.esa.int/Our_Activities/S...Asteroid_day/Every_day_is_Asteroid_Day_at_ESA
30 June 2016
ESA is participating in today’s international Asteroid Day, to mark the largest observed asteroid strike in recorded history – the 1908 airburst above Tunguska in Siberia. The Agency monitors asteroids as well as performs scientific research, not to mention contingency planning: what could be done if an asteroid were incoming?