On 30 June 1908, a prominent asteroid impacted the Tunguska region in the Russian Federation. The asteroid’s calculated diameter was 60 metres, and the impact’s energy was between 10 and 15 megatons of TNT. More recently, another asteroid impacted the Chelyabinsk region on 15 February 2013, injuring more than one thousand two hundred people and damaging several buildings. The asteroid broke up in the atmosphere nearly 30 km above the city and had an energy release of 30 kilotons TNT equivalent. As a result, the General Assembly declared 30 June as International Asteroid Day to raise awareness regarding asteroids.
Image from ESA: https://www.esa.int/ESA_Multimedia/Images/2011/10/Space_Safety_Programme_-_Near_Earth_Objects
CREDIT
ESA - P.Carril
