Jun 29, 2009
The Tunguska event is the fiercest, but not the only, momentous meteorite air burst in recent history. The Tunguska event is considered as one of the largest natural disasters of present day times. However, first, a brief reminder of what happened: the Tunguska Event is the title given to an enormous explosion, variously calculated to be in the region of two and forty megatons, which flattened upwards of a thousand square miles of near uninhabited Siberian woodland back in June 1908. The origin of the Tunguska event is for the most part accredited to the break up of a comet or meteorite following it entered the Earth’s atmosphere, but there are other people who assert that the source of the Tunguska explosion lies somewhere else. UFO enthusiasts have long alleged that the Tunguska event is the outcome of an exploding alien spacecraft or as some believe an out of this world weapon discharging to “rescue the Earth from an impending danger”.
However, almost 101 years on a new interpretation around what really happened has emerged from scientific researchers. Formerly, research workers best theory was that a meteorite collided with the forest, but scientific expeditions failed to identify an collision crater or any pieces of rock. The new theory, to be issued in the publication ‘Geophysical Research Letters’, puts forward that the Earth was stuck by the icy core of a comet, which erupted high in the atmosphere.
The Tunguska event has aroused much discussion, but it remains vague if it was generated by a comet, an asteroid, or a meteoroid. What is recognized is that following the event, bright skies at night were notable in a number of localities, especially Great Britain. Research workers express that clouds which shape in the polar region following space shuttle launches are a consequence of the rough transport of water from shuttle exhaust and records show that interestingly, similar clouds were visible at night long after the Tunguska event.
Night-time or “noctilucent” clouds are the tallest in the Earth’s sky, creating at an height up to 85km. They influence bright night skies when they are lit up by sunshine from past the horizon. These distinctive Noctilucent clouds were prominent in the polar regions by research workers following launches of space shuttle Discovery in 1997 in addition to Endeavour in 2003. Seeing that the shuttle’s main engine blends liquid oxygen with hydrogen, launches manufacture more than Three hundred tonnes of water that is dumped in the upper atmosphere.
However, it was ambiguous how a water vapour path could extend to a 1000km proportions and journey more than 8000km to the poles. At present, Michael Kelley of Cornell Institute and his associates suggest that supposed “planar turbulence” is to blame. The occurrence originates when, rather than being able to manoeuvre openly in three dimensions, liquids are restricted by, for instance, a magnetic field. Correspondingly as a result, they can move much more rapidly in two dimensions in which they are still unrestrained. The group claims that the water vapour may well get caught in such a two-dimensional skin, being funnelled to the poles rapidly while being extended out over enormous distances.
The study of the Tunguska event is significant considering that previous impacts with extraterrestrial bodies have had serious effects on the development of the earth and notwithstanding this new hypothesis one matter remains in that the Tunguska event is the greatest extraterrestrial impact in recent history.