By Jim Mesko
A- 26 Invader in motion - Squadron/Signal 1134 КНИГИ ;ВОЕННАЯ ИСТОРИЯ Издательство: Squadron/Signal courses Серия: airplane 134 Название: A-26 Invader in motion Язык: English Год издания: 1993 Количество страниц: forty nine ISBN: 0-89747-296-9 Формат: pdf Размер: 10.8 mb eighty five
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Additional info for A- 26 Invader in Action
Another reason for Paul Withers to doubt the impact was that he’d found no records of debris falling to Earth. The Chronicon Anglicanum of Ralph of Coggeshall, considered a reliable source, doesn’t mention either the lunar event or the eclipse of 1178, but Comets 41 he describes the finding of St. Alban’s relics that year. ” About 1% of the ejecta, hurled up from the lunar surface, would exceed the Moon’s escape velocity . The ‘sparks’ that were seen flying off into space must have been big, and there are two asteroids in orbits that could have originated in lunar impacts.
More recently it’s been claimed that stones found in the Khushmo River might be fragments from the asteroid , if it was one, but they could be from any meteorite fall , and if there is an older impact feature in the area they might have been washed out from that. The most recent thinking on it is that the object was a small comet that approached Earth unseen on the sunward side—a loosely structured object would fragment when the mass of atmosphere between it and the ground was equal to its own mass—and then supposedly all the ice evaporated and its kinetic energy was dumped into the atmosphere as heat, creating an explosion.
On the other hand, the small collecting area could mean that the traps would fill rapidly and any ice in them would now be very old . The Clementine probe in 1994 found signs that there was indeed ice at the south pole, in small craters within the giant impact basin Aitken, which is 2,500 km across and at least 12 km deep . First results from Lunar Prospector in 1998 supported that, but then suggested that at both poles there were much larger deposits of ice, very thinly mixed with dust .