Australia's Little Space Travellers: The Flight Shaped by Don McColl

By Don McColl

This e-book offers a show off for the quite well-preserved flight-textured tektites of southern Australia, that are the world’s most interesting recognized examples. It offers an summary in their kinds and flight positive factors, that are anticipated to seem, a minimum of partially, on any items falling from house. a few of these specimens are so completely formed that it really is difficult to think that they have got been buried within the fresh strata of Australia for 770,000 years. It additionally discusses the heritage of the tale in their superb flight into area and go back turning into generally authorized, which ended in them being famous as house tourists. additional, it describes their classical shapes and gives a proof of the way each one built. It offers creditors, meteoriticists, and museum curators with insights into the incredible varieties of Australian tektites produced through hypersonic flight.

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Extra resources for Australia's Little Space Travellers: The Flight Shaped Tektites of Australia

Example text

The few which do orient themselves usually develop a rather distinctive profile, with an ablated anterior surface which has some similarities to the tektites, in that it is at least roughly hyperbolic. It is also quite possible though, that various primary forms of tektites may enter the atmosphere while they are 36 Australia’s Little Space Travellers: The Flight Shaped … still rolling. This appears to be the best explanation for the tektite shown in the next photograph. It still has much of its original boat form, but has a ­pattern of moderately preserved irregular melting waves on both the anterior and posterior surfaces.

Whatever the case, during ablation these tiny pieces of molten glass would all follow the same flight dictates as for the bigger tektites—during their fall they 42 Australia’s Little Space Travellers: The Flight Shaped … present the maximum cross ­ sectional area at right angles to the direction of travel, and they orient themselves so that their centre of gravity is as far forward as possible. Initially they would continue to melt with ablated glass flowing back to form a flange, until such time as the tektite has slowed down to its limiting velocity in air.

Clearly many billions of them were formed initially, at the time of the explosive and catastrophic Southeast Asian tektite-forming event. The huge number of these tiny tektitelike droplets may also presumably, have been somewhat augmented by ablated droplets of glass derived from larger tektites at the time of their infall from space. Probably sharp-eyed s­earchers will discover more microtektite occurrences in Australia as time goes on, but they are so tiny that their discovery may require some kind of unusually favourable discovery environment.

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