Tunguska event

related topics
{math, energy, light}
{island, water, area}
{ship, engine, design}
{god, call, give}
{build, building, house}
{acid, form, water}
{day, year, event}
{film, series, show}
{war, force, army}
{album, band, music}
{work, book, publish}
{theory, work, human}
{village, small, smallsup}
{specie, animal, plant}

The Tunguska event, or Tunguska explosion, was an enormously powerful explosion that occurred near the Podkamennaya Tunguska River in what is now Krasnoyarsk Krai, Russia, at about 7:14 a.m. KRAT (0:14 UT) on June 30 [O.S. June 17], 1908.[1][2][3][3]

The explosion is believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5–10 kilometres (3–6 mi) above the Earth's surface. Different studies have yielded varying estimates of the object's size, with general agreement that it was a few tens of metres across.[4]

The number of scholarly publications on the problem of the Tunguska explosion since 1908 may be estimated at about 1,000 (mainly in Russian). Many scientists have participated in Tunguska studies, the best-known of them being Leonid Kulik, Yevgeny Krinov, Kirill Florensky, Nikolay Vasiliev, and Wilhelm Fast.[5]

Although the meteoroid or comet burst in the air rather than hitting the surface, this event is still referred to as an impact. Estimates of the energy of the blast range from 5 to as high as 30 megatons of TNT (21–130 PJ),[6][7] with 10–15 megatons of TNT (42–63 PJ) the most likely[7]—roughly equal to the United States' Castle Bravo thermonuclear bomb tested on March 1, 1954, about 1,000 times as powerful as the atomic bomb dropped on Hiroshima, Japan, and about one-third the power of the Tsar Bomba, the largest nuclear weapon ever detonated.[8] The explosion knocked over an estimated 80 million trees covering 2,150 square kilometres (830 sq mi). It is estimated that the shock wave from the blast would have measured 5.0 on the Richter scale. An explosion of this magnitude is capable of destroying a large metropolitan area.[9] This possibility has helped to spark discussion of asteroid deflection strategies.

The Tunguska event is the largest impact event over land in Earth's recent history.[10] Impacts of similar size over remote ocean areas would have gone unnoticed[11] before the advent of global satellite monitoring in the 1960s and 1970s.

Full article ▸

related documents
Impact event
Impact crater
Titan (moon)
Earth's magnetic field
Celestial navigation
Natural satellite
X-ray astronomy
Viscometer
Relative density
Stefan–Boltzmann law
Soliton
Degenerate matter
Voyager 2
Angular velocity
Wormhole
Tachyon
Flux
Magnetic sail
DESY
Van Allen radiation belt
Accretion disc
Electric potential
Ideal gas
Celestial mechanics
Hubble's law
Comet Hyakutake
Exotic matter
Interstellar medium
Crab Nebula
Biot–Savart law