Adobe acrobat reader 11 free download for windows 10.

 

Adobe acrobat reader 11 free download for windows 10

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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«Two-megaton» asteroid Apophis is excluded from the list of dangerous for the Earth for 100 years
27.03.2021 [21:07],
Gennady Detinich

The asteroid 99942 Apophis, first discovered on June 19, 2021, was until recently considered potentially dangerous for the Earth. This space body with a length of 340 meters and a mass of about 61 million tons could collide with our planet in one of the flights. The impact would be akin to the explosion of a two-megaton bomb, so Apophis was monitored from the moment of discovery. New data made it possible to exclude this asteroid from the list of dangerous for the Earth for at least a hundred years.

The trajectory of the passage of the asteroid Apophis past the Earth in 2029. Image Source: NASA / JPL-Caltech

Once again, Apophis flew past the Earth on March 5 this year at a distance of about 17 million km. Each new span made it possible to better and better determine the trajectory of the object. This time, the asteroid was monitored by a radar in Goldstone (California) and a 100-meter radio telescope at Greenbank Observatory (West Virginia). The signal sent by the radar bounced off an asteroid and was caught by a radio telescope. The measurement made it possible to refine the trajectory of Apophis and calculate with sufficient accuracy the distance of approach to the Earth in future passages: in 2029, 2038 and 2068.

Refined data show that in this century, all subsequent passages of Apophis near the Earth will be with zero probability of collision. For example, on April 13, 2029, an asteroid will pass at a distance of 32 thousand. km from the Earth, which has already been found out for sure. There is no more threatening scatter and uncertainty in the calculations, and the asteroid is excluded from the catalog of objects dangerous for the Earth.

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