Mike Adam’s sites are featuring an article which quotes astrophysicist Dr Alan Fitzsimons at the Queen University Belfast Astrophysics Research Centre, who says that there is a disturbing probability that an asteroid strike could wipe out the human race. There are millions of large Near Earth asteroids, many as big as 10-story buildings out in orbit, capable of impacting with the Earth: http://collapse.news/2017-06-28-astrophysicist-warns-humanity-will-eventually-be-wiped-out-by-an-asteroid-strike-just-a-matter-of-time.html.
In January 2017, asteroid 2017 BX passed by the Earth without any threat of collision. But, in November 2016, there was a narrow miss between the Earth and the asteroid 2016 VA, missing the Earth by only 77,00 kilometres, which is not much in cosmological terms, a bee’s whisker. In 2013, another small asteroid exploded over the city of Chelyabinsk in Russia, causing extensive damage. An air-burst asteroid exploded over Tunguska in Russia in Siberia in 1908, exploding with the energy equivalent of 185 Hiroshima bombs. So, it happens.