article_snippet: The findings were based on information released from the Nuclear-Test-Ban Treaty Organisation.
article_snippet: This operates a network of sensors that monitor Earth around the clock listening for the infrasound signatures of nuclear detonations.
article_snippet: But what the infrasound signatures of nuclear detonations found were not nuclear explosions, but rather asteroid impacts on a huge scale.
article_snippet: Between 2000 and 2013 the network detected 26 explosions on Earth ranging in energy from one to 600 kilotons - all caused by asteroid impacts.