12.18.16.2.6 is the Long Count date.

3 Cimi is the Tzolkin date.

4 Zotz is the Haab date.

The odds of Planet X hitting us are remote. Unfortunately, an impact is not necessary to cause major problems. Because of the gravity and magnetism of Planet X it will be able to disrupt things on earth from a distance, just as it is allegedly already doing to the solar system. Here's what McCanney says:
The effects on the Earth are very clear, both from my theoretical work and from what the ancients describe. There are episodes of mountain building. There could be a pole shift caused by a gravitational tidal wave that moves through the surface mantle of the Earth. There would be flooding both from tidal waves of the oceans, tremendous atmospheric storms and also from a huge pollution influx of oil and water -- hydrocarbons and water -- from inner planetary space onto Earth. And all of these things have been seen in the past.The Bible talks about, for example, when all the vermin, bugs, insects and snakes came out of the ground and overran the Earth. This was a direct result of the electric fields penetrating the mantle of the Earth and causing these creatures to leave the ground and come out of the ground. The atmospheric conditions include the increase in the number of volcanoes going off.I want to mention that these planetary objects do not have to come necessarily that close to Earth to cause even dramatic Earth changes. Electrical discharges can occur between the planets even a distance apart. These, in fact, have been measured with NASA satellites where, in the 1990s, we saw incredible electrical discharges flow between Jupiter and Earth, taking out a number of our communication satellites. The scientists at that time were totally puzzled that outer space could do this. They still don't understand the very electrical nature of our solar system.

In spite of NASA's coverup and difficulty of an observation, McCanney explains that there is quite a bit of evidence pointing to the existence and near passage of  Planet X.

Perturbations in the orbits of the planets:  As early as the mid-1800s scientists noticed the orbits of Neptune and Uranus not going exactly according to theoretical expectations.  These deviations could not be explained by miscalculations in the masses of the planets, as the direction of the deviations was downward according to McCanney.

Planet X

Nibiru is the name given by some to planet X.  Planet X 2012 and the end of the world are connected by those who believe that planet X exists beyond pluto and is on a collision course with earth.  They expect Planet X will either hit us or it will be a near miss which certain groups believe will take place in the early 21st century. Believers in this doomsday event usually refer to this object as Planet X or Nibiru.

These Solar flares are also the cause behind the beautiful northern lights (aurora).

Solar Flare

Solar Flares (large bursts of gas from the sun) happen all the time.  Approximately every 11 years or so, the sun seems to have an extra large burst of activity.  2012 was thought to be the end of the next 11 cycle where sun spots would start to appear as the tell tale sign of extra solar activity - i.e. solar flares (which stay close to the surface of the sun) and Coronal Mass Ejections (which can travel millions of miles out into space).  However, NASA scientists have said recently that it looks like the next cycle will come around in 2013 and not 2012.