Astronomer David Asher (from Armagh University) has agreed with Bill Napier and Janaki Wickramasinghe (Cardiff University) that “dark comets” are real and dangerous.
The following quotes are from a paper by Napier and Asher published in Astronomy & Geophysics.
http://star.arm.ac.uk/preprints/2009/539.pdf
We know that about one bright comet (of absolute magnitude as bright as 7, comparable to Halley’s Comet) arrives in the visibility zone (perihelion q<5AU, say) each year from the Oort cloud. It seems to be securely established that ~1–2% of these are captured into Halleytype (HT) orbits. The dynamical lifetime of a body in such an orbit can be estimated, from which the expected number of HT comets is perhaps ~3000. The actual number of active HT comets is ~25. This discrepancy of at least two powers of 10 in the expected impact rate from comets as deduced from this theoretical argument on the one hand, and observations on the other, is …
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Preparing for when the SHTF
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Don’t believe NASA – these are a genuine threat
More likely during eclipses and perhaps Comet Elenin is a factor?
When researching 2012 stuff, every now and then something poking fun at the meme lightens the doom for me. I found this video on a Ukranian 2012 site. Take a look, it’s only 52 seconds in length:
In case you don’t understand Russian, the reporter is initially discussing the price of electricity.
“Kiev, I belive that we have a Problem!”