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.

Coronal Mass Ejection

Coronal mass ejections (or CMEs) are huge bubbles of gas threaded with magnetic field lines that are ejected from the Sun over the course of several hours. Although the Sun's corona has been observed during total eclipses of the Sun for thousands of years, the existence of coronal mass ejections was unrealized until the space age. The earliest evidence of these dynamical events came from observations made with a coronagraph on the 7th Orbiting Solar Observatory (OSO 7) from 1971 to 1973. A coronagraph produces an artificial eclipse of the Sun by placing an "occulting disk" over the image of the Sun. During a natural eclipse of the Sun the corona is only visible for a few minutes at most, too short a period of time to notice any changes in coronal features. With ground based coronagraphs only the innermost corona is visible above the brightness of the sky. From space the corona is visible out to large distances from the Sun and can be viewed continuously. The animated sequence of images at the top of this page were obtained with the High Altitude Observatory's coronagraph on the Solar Maximum Mission in April of 1980.

solar flares

Solar flares happen when when energy stored in twisted magnetic fields is suddenly released causing an explosion of plasma shot up from the sun's surface.  Apparently the energy from these solar flares can be enough to produce 100 billion atomic bombs.  But it's nothing to be concerned about because this all happens low down in the sun's corona (outer surface).  This burst of electromagnetic radiation produced from these solar flares includes radio waves, x-rays and gamma-rays.  Sometimes there will be a CME (CORONAL MASS EJECTIONS)associated with solar flares.  Solar Flares and CME's can happen independently of each other.

The Truth about 2012 from NASA Lunar Science Institute on Vimeo.

NASA's David Morrison, expert on Earth impact hazards and currently Interim Director of the NASA Lunar Science Institute, speaks on what are the risk to Earth in 2012. He addresses misconceptions related to the year 2012, Earth crossing objects, planetary alignment, and related myths like Nibiru. 

For more information on this topic, please see
 astrobiology.nasa.gov/ask-an-astrobiologist/intro/nibiru-and-doomsday-2012-questions-and-answers.

Galactic alignment

Some sky-watchers believe 2012 will close with a "galactic alignment," which will occur for the first time in 26,000 years

In this scenario, the path of the sun in the sky would appear to cross through what, from Earth, looks to be the midpoint of our galaxy, the Milky Way, which in good viewing conditions appears as a cloudy stripe across the night sky.

Some fear that the lineup will somehow expose Earth to powerful unknown galactic forces that will hasten its doom—perhaps through a pole shift or the stirring of the supermassive black hole at our galaxy's heart.

Others see the purported event in a positive light, as heralding the dawn of a new era in human consciousness.

What is Galactic alignment? What causes it? Will it cause complete destruction of the world?
Read more here at  Galactic Alignment 

“His idea is original, of great simplicity, and—if it continues to prove itself—of great importance to everything that is related to the history of the earth’s surface.” – Einstein

Hopi

Some of the most specific prophecies come from Hopi tribe of the American South West. The Hopi believe that the world has been created and destroyed for four times and we are about to see the destruction of the fourth world. 

Centuries after the prophecies of the Merlin were written down, another  English Oracle appeared.
"When pictures seem alive with movements free,
when boats like fishes swim beneath the sea. 
When men like birds shall scour the sky. 
Then half the world, deep drenched in blood shall die. "

This prophecies came from Mother Shipton. Mother Shipton was born in 1488 in a cave near Knaresborouh, North Yorkshire,England. Mother Shipton correctly predicted the death of Henry the Eight and the defeat of the Spanish Armada. She predicted Queen Victoria by name.  and prophesized the upheavals  of world war I & II..

Wizard Merlin

We hear the wonderful stories of the mythical wizard Merlin from the tales. But that is the Merlin of fiction. The real Merlin was much darker with prophecies that foretold the end of the world. Merlin was considered one of the greatest Oracles in Europe. His prophecies include terrorist attack, global warming and planetary catastrophes possibly in our own time.

Merlin was described to be half man and half demon. He was called as Merlin the wild. A half craze man of a forest.

The Sybilline Oracles