Why does Siberia get all the cool meteors?

December 9, 2016 by Bob King , Universe Today
This photo shows trees felled from a powerful aerial meteorite explosion. It was taken during Leonid Kulik’s 1929 expedition to the Tunguska impact event in Siberia in 1908. Credit: Kulik Expedition

In 1908 it was Tunguska event, a meteorite exploded in mid-air, flattening 770 square miles of forest. 39 years later in 1947, 70 tons of iron meteorites pummeled the Sikhote-Alin Mountains, leaving more than 30 craters. Then a day before Valentine's Day in 2013, hundreds of dashcams recorded the fiery and explosive entry of the Chelyabinsk meteoroid, which created a shock wave strong enough to blow out thousands of glass windows and litter the snowy fields and lakes with countless fusion-crusted space rocks.

Now on Dec. 6, another fireball blazed across Siberian skies, briefly illuminated the land like a sunny day before breaking apart with a boom over the town of Sayanogorsk. Given its brilliance and the explosions heard, there's a fair chance that meteorites may have landed on the ground. Hopefully, a team will attempt a search soon. As long as it doesn't snow too soon after a fall, black stones and the holes they make in snow are relatively easy to spot.

OK, maybe Siberia doesn't get ALL the cool fireballs and meteorites, but it's done well in the past century or so. Given the dimensions of the region—it covers 10% of the Earth's surface and 57% of Russia—I suppose it's inevitable that over so vast an area, regular fireball sightings and occasional monster falls would be the norm. For comparison, the United States covers only 1.9% of the Earth. So there's at least a partial answer. Siberia's just big.

Every day about 100 tons of meteoroids, which are fragments of dust and gravel from comets and asteroids, enter the Earth's atmosphere. Much of it gets singed into fine dust, but the tougher stuff—mostly rocky, asteroid material—occasionally makes it to the ground as meteorites. Every day then our planet gains about a blue whale's weight in cosmic debris. We're practically swimming in the stuff!

Children ice skating in Khakassia, Russia react to the fall of a bright fireball two nights ago on Dec.6

Most of this mass is in the form of dust but a study done in 1996 and published in the Monthly Notices of the Royal Astronomical Society further broke down that number. In the 10 gram (weight of a paperclip or stick of gum) to 1 kilogram (2.2 lbs) size range, 6,400 to 16,000 lbs. (2900-7300 kilograms) of meteorites strike the Earth each year. Yet because the Earth is so vast and largely uninhabited, appearances to the contrary, only about 10 are witnessed falls later recovered by enterprising hunters.

Meteorites fall in a pattern from smallest first to biggest last to form what astronomers call a strewnfield, an elongated stretch of ground several miles long shaped something like an almond. If you can identify the meteor's ground track, the land over which it streaked, that's where to start your search for potential meteorites.

Meteorites indeed fall everywhere and have for as long as Earth's been rolling around the sun. So why couldn't just one fall in my neighborhood or on the way to work? Maybe if I moved to Siberia …

Documentary footage from 1947 of the Sikhote-Alin fall and how a team of scientists trekked into the wilderness to find the craters and meteorite fragments
A naturally sculpted iron-nickel meteorite recovered from the Sikhote-Alin meteorite fall in February 1947. The dimpling or “thumb-printing” occurs when softer minerals are melted and sloughed away as the meteorite is heated by the atmosphere while plunging to Earth. Credit: Svend Buhl
Meteors are pieces of comet and asteroid debris that strike the atmosphere and burn up in a flash. Here, a brilliant Perseid meteor streaks along the Summer Milky Way this past August.  Credit: Jeremy Perez
A couple more videos of the Dec. 6, 2016 fireball over Khakassia and Sayanogorsk, Russia

Explore further: Smallest known asteroid characterized using Earth-based telescopes

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7 comments

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rderkis
not rated yet Dec 09, 2016
Gosh,Siberia is so lucky! (Sarcastically) I wish they would fall here and kill my city and family.
gkam
1 / 5 (4) Dec 09, 2016
Those objects come from outside the ring plane of the solar system. I understand the radar coverage in that direction is poor.
TheGhostofOtto1923
3 / 5 (4) Dec 09, 2016
Those objects come from outside the ring plane of the solar system. I understand the radar coverage in that direction is poor
Ahaahaaaaa george you've proven that you are an abject failure at pretending to be an engr. Why would you think you could get with pretending to be an astrophysicist?

The solar system doesn't have a 'ring plane'.

My god you're stupid.
gkam
2.3 / 5 (6) Dec 09, 2016
The planets and asteroids formed from it.

My god, you are Donald Trump, accusing others of your character.
TheGhostofOtto1923
3.7 / 5 (3) Dec 09, 2016
It's called something else. Why don't you look it up and learn why you can't pretend here?
del2
not rated yet Dec 09, 2016
Siberia ... covers 10% of the Earth's surface ... For comparison, the United States covers only 1.9% of the Earth.

Something wrong with these figures.The article is claiming that Siberia has over 5 times greater area than the U.S.A. However, from Wikipedia, the area of Siberia is 13.1 million square kilometres, while the U.S.A. has an area of 9.9 million square kilometres (rounded to 1 dec. place). Even if just the contiguous U.S. states are considered the area is 8.1 million square kilometres. Nowhere near the factor of 5 claimed here.
gkam
1 / 5 (4) Dec 10, 2016
Siberia gets the meteorites for the same reason the Bible Belt gets all the world's deadliest tornadoes: God hates them.

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