Computer Science
Scientific paper
Nov 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960insp.symp.....o&link_type=abstract
Technical Report, International Space Symposium
Computer Science
Tektites, Silicon Dioxide, Meteoritic Composition, Ablation, Heating, Chemical Composition, Geochemistry, Artificial Satellites, Perigees, Liquefaction, Alkalies
Scientific paper
Tektites are probably extraterrestrial, rather than the result of sheating some terrestrial materials, because they are a chemically shomogeneous group with definite peculiarities (high silica, excess of salkaline earths over alkalis, excess of potash over soda, absence of swater), and because some of them (the australites) appear to have sundergone ablation in flight through the atmosphere. Since comparatively sslow heating is required to explain the liquefaction of the tektite smaterial, it is suggested that the tektites arrived along orbits which swere nearly parallel to the surface of the earth, and which resulted sfrom the decay of the orbit of a natural satellite. The great meteor sprocession of February 9, 1913, is an example of such an object. sComparison with the reentry phenomena of the artificial satellite 1957 sBeta suggests that the 1913 shower consisted of a single large stone sweighing about 400 kilograms, and a few dozen smaller bodies weighing sabout 40 grams each, formed by ablation from the larger body. It is sshown that under the observed conditions considerable liquid flow would sbe expected in the stone, which would be heated to about 2100 K. Objects sfalling from such a shower near the perigee point of the orbit would shave a considerable distribution along the orbit as a result of slight svariations in height or drag coefficient. The distribution in longitude swould be made wider by the turning of the earth under the orbit during sthe time of fall. The ultimate source of the body which produces a stektite shower is probably the moon, which appears, by virtue of its spolarization and the phase distribution of the returned light, to scontain high-silica materials. It is suggested that the Igast object salleged to have fallen in 1855 is in fact genuine and represents an sunmelted portion of the lunar crust.
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