posted on Sep, 14 2013 @ 09:04 PM
reply to post by Trueman
A nova is a short term event lasting only a few days or weeks.
Now a large cometary fragment trapped in an inner solar system orbit could be a yearly event as the earth crosses it's orbit. Just like taurid
meteor storm which is earth passing through the tail of the disintegrating comet enke.
They are what is left of a extremely large comet that was captured by the solar system nearly 40 k years ago.
There is ample evidence for impacts in SA for the time period n question.
To fully understand the idea I highly recomend reading Napier and Clubes work on the taurid progenitor comet.
Here's an abstract of w Napier's 2009 paper
There is now compelling evidence that an exceptionally large (50-100 km) comet entered a short-period, Earth-crossing orbit some time in the Upper
Palaeolithic, and underwent a series of fragmentations. During this disintegration the Earth was probably subjected to occasional episodes of intense
bombardment. Such an episode might constitute a sensible astronomical framework for understanding the postulated catastrophe at 12,900 BP.
Concentrations of sub- kilometre bodies may still exist in meteor streams and constitute a significant hazard. Such bodies are difficult to detect,
and current deflection and mitigation strategies do not seem adequate to deal with them. For larger bodies, a paradox exists in that the number of
comets expected to be thrown into Halley-type orbits (periods 20-200 years) is at least two orders of magnitude greater than observed. The fate of
these comets is unknown, raising the prospect that a significant population of dark Earth-crossing comets may exist and adding further uncertainty to
impact hazard assessments. Discrete bombardment episodes are evident in the well-dated impact record of the past 250 Myr and several coincide with
transitions between geological periods. There is evidence that these episodes have a ∼ 35-37 Myr periodicity, which may be connected to Galactic
disturbances of the Oort comet cloud. The threshold for periodicity begins for impact craters >∼ 40 km in diameter; since this is also the threshold
which impact ejecta create worldwide conflagration, it again implies that comets are a significant, if not dominant, component of the global impact
The taurids figure heavily in the genesis of world wide myth of angry gods, battles between the sun and moon, and such.
They also produce spectacular fireballs with long tails, that I belive are the origins of tails of dragons and flying feathered serpents.