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According to a new study published in the Thursday issue of Science, massive rocks have fallen from space twice as fast as usual.
But the study has no worries: asteroids have fallen on Earth for 290 million years, more than twice as much as 700 million years ago.
Asteroids still collide with the Earth on average every few million or even millions of years, even as the collision rate increases.
The NASA list does not show a fall of large potential rocks or large impending threats.
The biggest known risk is an asteroid 1.3 km wide with a 99.988% probability of not touching the Earth when it will be very close in 861 years.
Most scientists believe that dinosaurs and many other species have disappeared after the crash of a huge space rock in Central America about 65 million years ago.
"These events are so rare and so far that I do not worry about them," said Sarah Mazroui, scientist in planetary sciences at the University of Toronto, author of the study. It's just a game of possibilities. "
Mazroui and his colleagues from the United Kingdom and the United States have compiled a list of drill holes on the ground and moon, with a length of more than 20 km and indicating their dates.
A large nozzle must fall into a space rock 800 meters wide.
The team recorded 29 holes dating back more than 290 million years and 9 between 291 million and 650 million years ago.
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