& # 39; Potentially dangerous & # 39; asteroids to fly over the earth

"There is absolutely nothing to do with this 2016 NF23 pass," Lindley Johnson, NASA's planetary defense officer told space.com.

"This object is only called a potentially dangerous asteroid (PHA) because its orbit is within 8 million kilometers of Earth's orbit, but there is nothing dangerous for the Earth or even unique to this pass of the Earth. asteroid."

The second asteroid of this week that puts fear of god in headlines is 1998 SD9. It will be much closer than 2016 NF3 – in fact, the closest passes through a "potentially dangerous" asteroid in the next two months – but still four times further away than the moon.

That brings us to TB145 – the probable ex-comet that looks remarkably similar to a human skull. It was our last passed on October 31, 2015 and appropriately the & # 39; Halloween asteroid & # 39; called. His next appearance in our part of the solar system will be on November 11, when it will be about 39 million kilometers away – a quarter of an hour from here to the sun, and despite its fearsome appearance, no danger.

In 2015, when it was first noticed, it was only 486,000 km away – a bit further than the moon.

What would happen if they hit us?

In an alternative universe when all asteroids hit the earth, the effects are potentially more than just dangerous.

1998 SD9 is between 38 and 86 meters wide and travels at 10.7 kilometers per second. No one knows for sure what it is made of, but if it were dense rocks and the earth would hit a 90-degree angle, it would make a crater a mile and 300 meters deep, according to Purdue University's Impact Earth tool. . The resulting airflow would tilt nearby buildings, collapse highways and blow away trees. The explosion would be roughly equivalent to the legendary Tunguska explosion of 1908.

2016 NF3 is a maximum of 160 meters wide and traveling at 9 km / s. It would have nearly twice as much energy as the SD9 from 1989, and the explosion would register 5.5 on the Richter scale a kilometer away. The crater would be 2 km wide and 460 m deep.

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