Gamma ray bursts
In part 2 of "Real Doomsday?" Gamma ray bursts are looked at.
Quotes from http://www.mondovista.com/endtime2x.html
Gamma ray bursts come from the Galaxy's core and are deadly:
A burst of the same intensity as the 1997 event, originating from inside the Milky Way, would deliver 100,000 time the lethal dose of radiation, killing every life form that was exposed. Could that really happen to us?
Even a close gamma ray pulse can be damaging:
This question was answered on August 27th, 1998 when an unusual 5 minute gamma ray pulse was located just 20,000 light years away in the constellation of Aquila. This may sound like a huge distance, but to astronomers this is just "next door." The Milky Way Galaxy, for example, is just 100,000 light years from end to end.
The 1998 event was close enough and strong enough to ionize Earth's upper atmosphere, damage a couple of spacecraft and disrupt global communication. Since then astronomers place gamma ray bursts from the Glaxy's core at the top of the list of things we don't want to happen.
Cyclical and frequent explosions:
Not in my galaxy!
Ironically, all of these facts are incorporated in LaViolette's "superwave" theory. He concludes that there are cyclical and frequent explosions from the Galaxy's core. These waves of radiation advance outward to the edges of the Galaxy, impacting everything and causing stars to erupt in their path. He believes this is what has happened many times to our own solar system -- the most recent superwave of radiation being 14,950 years ago. He envisions the shock wave -- or superwave -- dragging cosmic dust along with it as it enters the heliopause and energizes our Sun.
Ice core samples support this view. Evidence of the effects from cosmic dust show at ice core strata corresponding to the years 13,880 to 13,785 BCE. This evidence, along with the Moon glass, the presence of cosmic dust and the abrupt and atypical end of the last ice age -- all point to an intimate relationship between extreme solar activity and gama radiation from the Galactic center.
Very high energy rays:
Something has changed
More troubling is the suggestion by some scientists that this powerful radiation may not require a dramatic burst or explosion to cause eruptions in the Sun. Physicists at nearly a dozen research institutions, including New York University, have discovered evidence for very high energy gamma rays emitting from the galactic equator in the Milky Way. These gamma ray levels mark the highest energies ever detected from the Galaxy.
The gamma rays had a median energy of 3.5 trillion electron-volts, or 3500 times the mass-energy of a proton. Previous satellite experiments have seen gamma-ray emissions along the galactic equator reaching up to energies of only 30 billion electron-volts.
Perhaps related to this is the puzzling fact that, even though we have witnessed no Galactic explosions or "bursts", the measurements of cosmic dust streaming inside the heliopause as been steadily increasing  to almost three times since the last solar maximum in 2001.
Sun no longer blocking the dust:
During the solar maximum of each 11 year cycle, the polarity of the Sun shifts -- North becomes South and visa versa. This brief period of magnetic instability allows some cosmic dust to enter the heliopause because the Sun's "shields" are reduced. But once the new polarity is established, the Sun usually quickly blocks the dust. This time it didn't happen. Cosmic dust has been streaming in from the Glactic center and astronomers are at aloss to explain why.
It's likely that the solar system is already experiencing the invasive energy from the Galactic equator as we move into position and align with it on 2012.
Energy converging at the poles:
If the Earth was zapped by high energy radiation, either from the Sun or the Galactic core, the planet would be surrounded with distinct lines of energy, converging at the North and South pole. These bands would continue to extend well out from the planet's poles and into space and would be visible from almost every point on Earth -- each with its own unique perspective.
What is Known for sure:
Substantial data suggests that an event, similar to the one anticipated in the 2012 "doomsday" scenario, occurred and was recorded by ancient humans about 14,950 years ago. This event appears to have lasted for several years in duration and was responsible for the abrupt end of the last ice age as well as a substantial culling of the human population.
The surprising data revealed by LaViolette and supported by other research suggests that the extreme solar event corresponded to powerful radiation coming from the center of the Milky Way Galaxy and associated with gamma rays. Recent observations have shown a dramatic increase in gamma ray energy in the Glaxy's equator which will be in maximum alignment with our solar system on December 12, 2012. The past records in ice cores (strata from 13,880 to 13,785 BCE) show that intense radiation could have lasted many years. It seems highly likely that this alignment will cause extreme solar events since other factors precipitating a "solar maximum" (i.e. the opposition of major planetary barycenters) also converge on this exact date.
The fact that galactic centers routinely radiate lethal gamma rays makes it unlikely that life, at least as we understand it, can survive in the universe. Sooner or later it is destined to be zapped.
We survived the last one:
A new genetic study of Y-chromosome variation by Dr. Marcus Feldman of Stanford University shows that the population from which the world's present population is derived consisted of about 2,000 individuals. Somehow, humans, flora and fauna did survive the past doomsday and some may yet survive past 2012. Indeed, many of the ancient prophecies I have encountered in my travels around the world have spoken of a "bright light" or "flash" followed by the "good seed" (i.e. humanity) which would rise up and repopulate the world.
Are we to be Zapped?