Supporting 21st Century Science GCSE

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Evidence for Extraterrestrial Impacts...

Here are some images you can use in your project about extraterrestrial impacts. These latest images were taken in April 2007 at Meteor (Barringer) Crater, Arizona

Meteor (Barringer) Crater is o­ne of the best preserved examples of impacts from outer space...

The latest images of  Meteor Crater can be found in the Image Gallery

Please feel free to use them in your educational projects...

Located 35 miles East of Flagstaff, and a 5 mile drive off Interstate highway I-40, the Barringer Meteorite Crater, as it is known in the scientific community, is o­ne of the best preserved craters o­n Earth since its formation approximately 50000 years ago.

The crater is 1.2 kilometres in diameter, and 200 metres deep. What conditions need to exist for a crater of this size to be formed? Calculations have shown that the meteorite would need to be 50 metres in diameter and travelling at a velocity of 11 kilometres per second. There are two factors which are important in the energy of movement ; the mass of the body , and its velocity. A diameter of 50 metres might not seem that big, but its high velocity was a significant factor in the destructive power (the energy is proportional to the square of its velocity !)

Under such an impact the iron-nickel meteorite most of it would have melted, disintegrated, and it would have been partially vaporised. Similar conditions arose for the rocks and iron o­n the ground, as a result of the enormous pressures and high temperatures, from the energy of impact. What an excellent example of the conversion of kinetic energy into heat energy ! Yet some of the kinetic energy was used in complete fragmentation of rocks beyond the melted region, and in the energy needed to eject these rock at high velocities from the ground into the air.

In 1902 a mining engineer, Daniel Barringer, thought that the crater was formed by an enormous iron meteorite, which would have been buried below the surface . He formed the Standard Mining Company, which involved acquiring the land within a two mile radius of the crater. Some of the mining areas within the crater, can be viewed from the rim of the crater. 25 years was spent trying to uncover the meteorite, and this was accompanied by extensive scientific research.

Some of the research enabled the trajectory of the meteorite to be calculated from studying the positions of the sandstone and limestone beds around the crater. It is now accepted that the meteorite, travelling as such a velocity would have been totally disintegrated as a result of the combination of the processes of vaporisation, melting of the meteorite, and in the fragmentation upon impact with the ground.

The Barringer Crater was o­ne of the official centres by NASA for training Apollo astronauts. The terrain is similar to that found o­n the Moon, and proved to be a valuable training resource.

Entrance to the now controlled by Meteor Crater Enterprises Inc, which has a long-term lease with the Barringer family. There is a visitors centre, with exhibits of the science of meteorites and the history of the site, and the use of the crater in the NASA Apollo Space Programme

The latest images of  Meteor Crater can be found in the Image Gallery

Further information about Meteor Crater and other impact craters around the world:

Meteor Crater Homepage
Barringer Crater
Images of the Crater (NASA)
Earth Impact Database

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