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Earth's Near Misses With Asteroids

Friday, February 15, 2013

A meteor exploded in the sky above Russia Friday morning. But astrophysicist Neil deGrasse Tyson says that's tiny compared to asteroid 2012 DA14, which will be flying by the Earth Friday afternoon. 

The asteroid will come within 17,500 miles of the planet, closer than some satellites orbit the Earth.

Dr. Tyson, director of the Hayden Planetarium, says there are no precise numbers on how often asteroids pass within a hair's breath of the planet. While there is some suggestive data, many such occurrences may happen over oceans and go unnoticed. "Perhaps you get one of them a decade."

Asteroids are not uncommon, he said, "the solar system is a shooting gallery." But 2012 DA14 is of particular note because of its proximity. It will come about 5,000 miles closer to the Earth than some communications satellites. 

"So now it's kind of like invading our space, so to speak," said Tyson. "And it will, rightly, get extra attention."

View a simulation of the asteroid's flight path:

While NASA says the Russian meteorite is unrelated to asteroid 2012 DA14, Tyson says that's hard to know. He says many asteroids are not solid rocks but piles of rubble traveling together through space, and as those groupings travel, the gravity of the planets they pass can stretch them out from a circular pile into what he described as "a train of rocks." 

"When that happens, one impact will be followed by others."

He admits, it's unlikely that the meteorite that crashed in the Ural mountain region is related to 2012 DA14 because of the hours separating the two events.

While Tyson says the asteroid will not hit the Earth, he cautioned about getting too cocky. "By the way, if we were  and pass in our orbit 15 minutes earlier than we will be this afternoon, then it would hit us."

Weather permitting, real-time imagery of the asteroid's flyby will be streamed beginning at about  12 p.m. EST.


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Neil deGrasse Tyson

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Comments [4]

ALJAZEERA from WWW

PLEASE ADOPT YOU ALL SELF ON MOTHER EATHER THAT MANY ASTEROIDS WILL END THE WORLD BECAUSE TOO MUCH PEOPLE ON EARTH AND WE CANN'T SUSTAIN UYOU ALL LIFE AND THESE ASTERIODS INCIDENT ARE WARNING SIGN OF WHAT NEXT TO COMES IN THE FUTURE .

Feb. 16 2013 12:17 PM
tomfromharlem

To Carolina:

rye crisp!

Feb. 15 2013 08:14 PM
Carolina

To Tom from Harlem:

SPOILSPORT!

Feb. 15 2013 02:32 PM
tomfromharlem from nyc

I found this segment in bad taste. Radio Lab has charm. But there is nothing charming about turning hard news into sesame street learning fun with cute sound effects and movie samples, especially when over 500 men, women, and children have been injured, and so recently. I very much appreciate learning the causes of an airburst and shockwave. But if you had just gotten to it, instead of drawing it out into fun-time, I could have wrapped my head around it that much quicker, and been sooner to meditate on the import of the event, without the bad aftertaste to my coffee.

Feb. 15 2013 10:11 AM

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