Phil Plait at his Bad Astronomy blog brings his effortless 'astronomically correct' version of PC to the table adding a new dimension to the Younger Dryas impact event, according to George Howard at http://cosmictusk.com/boslough-plait-comet-mars-sliding-spring-c2013-a1 … and while not directly refuting The Bos it does put in doubt his claims that a comet would have a local affect. It also validates the Napier Astronomical Model, probably unintentionally. Plait is famous for sticking rigidly to mainstream boundaries and has consistently remained aloof from the Younger Dryas boundary event debate. In this post he appears to have inadvertently buttressed the Napier model – see www.slate.com/blogs/bad_astronomy/2013/02/28/mars_impact_the_red_planet_… … but the subject here is also interesting as he is referring to the recently found comet that has been calculated to have an orbit that will bring it very close to Mars. He insists comets are not solid objects but are made of loose piles of rubble held together by ice. As the ice sublimates, he assures his readers, some of that rubble escapes, consisting of sand grains, gravels, stones and small rocks, which orbit in sync with the comet's path and are responsible for meteor showers etc. The coma, he says, can be several hundred thousands of kilometers across, quite a different scenario than painted by Boslough et al. The coma could well be bigger that the predicted distance the comet will be away from Mars so that even if there is no actual impact there will be a very heavy meteor bombardment of the red planet. We could be due to get a preview of what might have happened on Earth in the past – especially the kind of scenario outlined by Moe Mandelkehr in various SIS articles. See also www.nightskyhunter.com
Meanwhile, at http://phys.org/print281178724.html … it is asked, what exploded over Russian? (in February). It seems that researchers have been trying to piece the evidence together, from different strands. One of them is a network of infrasound sensors around the world as operated by the Comprehensive Test Ban Treaty Organisation (designed to moniter nuclear explosions). Meteors entering the atmosphere cause ripples of infrasound and this has been used to work out how long the meteor concerned was in the air, which direction it travelled and how much energy was unleased.