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NASA Space Shuttle Solves Mystery of Earth's Greatest Explosion: The 1908 Tunguska Event in Siberia

Cloud The mysterious 1908 Tunguska explosion that leveled 830 square miles of Siberian forest was almost certainly caused by a comet entering Earth's atmosphere, says new Cornell research. The conclusion is supported by an unlikely source: the exhaust plume from the NASA space shuttle launched a century later.

The Tunguska Event, a massive explosion near the Tunguska River in what is now Krasnoyarsk Krai, Russia, at around 7:14 a.m.on June 30, 1908, has been the focus of intense speculation. Theories such as a natural H-bomb, a black hole, an antimatter explosion and even the crash of a UFO the size of Tokyo, have kept the buzz alive for the past hundred years .


The Cornell research supports the findings of a British astronomer who suggested in 1930 that the blast may have been caused by a small comet, composed specifically of ice and dust, thus leaving no recognizable trace of its presence. One theory proposes that the Tunguska object was a fragment of Comet Encke. This ball of ice and dust is responsible for a meteor shower called the Beta Taurids, which cascade into Earth's atmosphere in late June and July - the time of the Tunguska event.

Possible the greatest factoid from the Tunguska Event however, is that if it had taken place a mere 4 hours and 47 minutes later, due to the Earth’s rotation, St. Petersburg would have been completely obliterated.

"It's almost like putting together a 100-year-old murder mystery," said Michael Kelley, the James A. Friend Family Distinguished Professor of Engineering at Cornell, who led the research team. "The evidence is pretty strong that the Earth was hit by a comet in 1908."

The research connects the two events by what followed each about a day later: brilliant, night-visible clouds, or noctilucent clouds, that are made up of ice particles and only form at very high altitudes and in extremely cold temperatures.

The researchers contend that the massive amount of water vapor spewed into the atmosphere by the comet's icy nucleus was caught up in swirling eddies with tremendous energy by a process called two-dimensional turbulence, which explains why the noctilucent clouds formed a day later many thousands of miles away.

Noctilucent clouds are the Earth's highest clouds, forming naturally in the mesosphere at about 55 miles over the polar regions during the summer months when the mesosphere is around minus 180 degrees Fahrenheit (minus 117 degrees Celsius).

The space shuttle exhaust plume, the researchers say, resembled the water vapor from the comet. A single space shuttle flight injects 300 metric tons of water vapor into the Earth's thermosphere, and the water particles have been found to travel to the Arctic and Antarctic regions, where they form the clouds after settling into the mesosphere. The thermosphere is the layer of the atmosphere above the mesosphere.

Kelley and collaborators saw the noctilucent cloud phenomenon days after the space shuttle Endeavour (STS-118) launched on Aug. 8, 2007. Similar cloud formations had been observed following launches in 1997 and 2003.

Following the 1908 explosion, known as the Tunguska Event, the night skies shone brightly for several days across Europe, particularly Great Britain -- more than 3,000 miles away. Kelley said he became intrigued by the historical eyewitness accounts of the aftermath, and concluded that the bright skies must have been the result of noctilucent clouds. The comet would have started to break up at about the same altitude as the release of the exhaust plume from the space shuttle following launch. In both cases, water vapor was injected into the atmosphere.

The scientists have attempted to answer how this water vapor traveled so far without scattering and diffusing, as conventional physics would predict. "There is a mean transport of this material for tens of thousands of kilometers in a very short time, and there is no model that predicts that," Kelley said. "It's totally new and unexpected physics."

This "new" physics, the researchers contend, is tied up in counter-rotating eddies with extreme energy. Once the water vapor got caught up in these eddies, the water traveled very quickly -- close to 300 feet per second.

Posted by Casey Kazan from materials provided by Cornell University.

Image Credits: M.J. Taylor and C.D. Burton/Utah State University; shows Noctilucent clouds observed from Donnelley Dome near Fairbanks, Alaska, resulting from a post-space shuttle plume in August 2007.    

The paper is available at: http://www.agu.org/journals/gl/papersinpress.shtml.
http://www.news.cornell.edu/stories/June09/TunguskaComet.html

Comments

Wow. That's cool, kinda like forensic astronomy.

Great work guys...

Yes Ice Clouds (a family,,, includes Noctilucent Clouds ) are water ice way up in the very cold reaches of the atmosphere... the type mentioned occur at the very edges of space.... thus the Sun illuminates them long after sunset

In the comet and space shuttle examples, the extra ice crystals were injected there

[Note comets are composed of hydrogen peroxide ice,,,, not water ice
decomposition releases high energy + oxygen + water vapour ------ leading to an ultra high energy release in a carbon based world]

Today:- With the new Ice Age...dry air water vapour is being driven higher and higher, it is not coming down as rain... a rarer and rarer event because of the the Great Drying (petroleum oil membrane on the ocean's surface preventing water evaporation leading to less water vapour in the atmosphere)

Today, Noctilucent cloud sightings (normally a rare event) are increasing in both the Northern and Southern Hemispheres... at latitudes pushing towards more and more towards the equator

Earth is entering the final stages of dehydration, ice melt and eventually snowball Ice Age.

And it is happening very very very rapidly.

Dang, I was hoping for the catalyst of Tunguska Event to have been a UFO !!

Or maybe something exotic like a mini - black hole.

Ah, well. At least we know that comets have impacted Earth in the past, & now we know what to look for in the future. A few decommisioned nuclear warheads would alter its course, one would hope.


Small comet or similar stuff ...with and approach angle NOT to hit the ground.

That is the most likely explanation of Tuguska event.

Missing remnants ??? Possible.... but NOT 100% sure...who made extensive researches about remnants on the ground ??

Comets can be bad and sometime odd guys.

GOD save humans from a main impact of a main body.

Regards

I think it was a combination of a comet...igniting biogas in the dense swamp region.

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