Meteorite impact

In the timeframe of the geologically recent history of the Earth, say, 100 million years, several large meteorites have hit Earth. The Cretaceous-Tertiary asteroid, for example, is theorized to have caused the extinction of the dinosaurs. If such an object struck Earth it could have a serious impact on civilization. It is even possible that humanity would be completely destroyed; for this, the asteroid would need to be at least 1 km (0.62 miles) in diameter, but probably between 3–10 km (2–6 miles).Asteroids with a 1 km diameter impact the Earth every 500,000 years on average. Larger asteroids are less common. The last large (>10 km) impact happened 65 million years ago. So-called Near-Earth asteroids are regularly being observed.
A star passage that will cause an increase of meteorites is the arrival of a star called Gliese 710. This star is moving on a near collision course with the Solar System and will likely pass within 1.1 light years from the Sun in 1.4 million years. Some models predict that this will send large amounts of comets from the Oort cloud to the Earth. Other models, such as the one by García-Sánchez, predict an increase of only 5%.