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The primary concept in both these proposals was that com-etary nuclei were aggregates of smaller icy planetesimals,brought together at low velocity in a random fashion. Withlittle in the way of modifying processes or energy sourcesavailable to change this initial structure, the cometary nu-clei would preserve their highly irregular initial shapes andvery porous, easily fragmented structure over the historyof the solar system.The arguments of Donn and colleagues came from theirstudies of the accretion of small grains in the solar nebula,realizing that random accretion would lead to self-similarstructures at larger spatial scales.
Но нет такого на космических объектах!
Статья-то статья.... а в реальности? Хоть один астероид, планета и др. похожа на фрактал?
The final resolution of this question requires the detailedstudy of a cometary nucleus (or many nuclei) at close range,something that can only be accomplished using a nucleus-orbiting spacecraft, and perhaps may even require a nucleuslander. TheRosettamission of the European Space Agency( Schwehm, 2002) includes experiments designed to inves-tigate the internal structure of the nucleus of periodic comet67P/Churyumov-Gerasimenko (hereafter, 67P/CG).Rosetta, to be launched in February 2004, is expected to rendezvouswith 67P/CG in August 2014. A key experiment is the CometNucleus Sounding Experiment by Radiowave Transmission(CONSERT) (Barbin et al., 1999). CONSERT is a radartomography experiment consisting of a transponder on theRosetta lander and a radar transmitter/receiver on theRosetta orbiter. If the lander is able to survive several weeksor months on the nucleus surface, it will allow the orbitersufficient time to orbit the nucleus many times, obtainingnumerous ray paths through the nucleus. The experimentis somewhat hampered by the fact that there is only onelander (two were originally planned). However, CONSERTshould yield considerable insight into the interior of the67P/CG nucleus, including the location and dimensions ofany substantial voids.The gravity mapping experiment onboard Rosetta willprovide additional evidence on the internal structure of thenucleus (Pätzold et al.,2001). Mapping of higher harmon-ics in the 67P/CG gravity field, coupled with a detailedshape model obtained from the Rosettaimaging experiment, OSIRIS (Thomas et al., 1998), will provide evidence of den-sity inhomogeneities within the nucleus, as well as an overallmeasure of the bulk density of the nucleus. TheRosetta spacecraft may orbit as close as 1 km to the surface of 67P/CG.A third source of information is the imaging experimentitself, which will provide submeter-resolution images of theentire nucleus surface. These images should provide suffi-cient resolution to understand the mechanisms creating thenucleus morphology, and may provide evidence of faults,substructure, or other landforms that help to reveal the in-ternal structure of the nucleus.
Как назвать столь сложную форму кометного ядра? Наковальня? Ботинок?
Не может же радиоизлучение сквозь ядро кометы проходить.
http://blogs.esa.int/rosetta/2014/07/16/access-to-rosetta-data/
Кстати, забыл упомянуть, сегодня в 17-00 МСК должны быть новые снимки.
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Тема: "Розетта" (Прочитано 282218 раз)
