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Opinion – Agencies
NEW YORK (Reuters) – A massive rock falls from space more than twice as much as usual, but they said there was no place for it. worry.
According to the study published in the Thursday issue of Science, there are more than 290 million years, asteroids have fallen to Earth more than twice as much as there are 700 million years ago. 39; years.
However, there is no need to worry, as asteroids continue to hit the Earth on average every few million or millions of 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 danger known 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 breeds have disappeared as a result of 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 in the United Kingdom and the United States drew up a list of the 20-kilometer ground holes and the 20-kilometer moon that indicated their dates.
A big nozzle needs the fall of a space rock 800 meters wide.
The team has registered 29 polls dating back to 290 million years and 9 holes between 291 million and 650 million years ago.
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