Asteroid Collision With Earth Inevitable, Say Experts

: An asteroid strike on Earth is just a matter of time and it could destroy major cities, experts have said. According to Alan Fitzsimmons from Queen's University Belfast in Britain, it is a case of when an asteroid collision will happen, rather than if it will happen.

The warning comes ahead of the Asteroid Day to be observed on June 30. On that day in 1908, a small asteroid exploded over Tunguska in Russia's Siberia, levelling trees and burning the ground over 2,000 square kilometres.