NASA scientists have warned that Earth could be three times more likely to be hit by an asteroid than previously thought following new data.
This was the stark warning from James Garvin - the Goddard Space Flight Center Chief Scientist - after his team analysed data from several Earth-observing satellites to examine four impact craters and identified larger rings around the sites.
Garvin and his team now believe that four asteroids strong enough to blow off part of the Earth's atmosphere have hit in the last one million years.
