Key findings of the Mayan / alien calendar

First The Haab and Tzolkin calendars are cyclical, they engage and rotate like gears. The Long Count calendar, however, is linear. Its early date signifies the beginning of a new era to an end the end of this particular age. Then the long count starts over again. So it starts at the end of each long count again in a new era. According to the Maya, we find ourselves in the 4th Age, which on 11 August 3114 BC and began to expire on 21/12/2011. Why did the Maya 11 August 3114 BC as the start date selected white until today no one exactly. We can therefore assert that, according to the Maya, the world will not perish entirely, but that the world as we know it ending and something new will begin. Reassuring. But what exactly is and the what's new, what should you start?
Second The Maya shared the chronological period from the occurrence of one of the world in nine underworlds, each underworld was again split up into heaven 13. Each sub-world is going through so each time 13th Heaven. So shall the 08th March 2011, the ninth, then start last underworld, and on 10 13th October 2011, the last Heaven. The last sub-world and the heavens shall last thus end on 21.12.2012. This one should know that the 9 Underworlds as a pyramid built upon each other and have names which designate the development of the earth and mankind. The first is called underworld e.g. "Cellular underworld" and the period known as the life of the world still consisted of single-celled organisms, the second sub-world is called "mammal underworld" and refers to the time of the dinosaurs. The last sub-world is called "Universal Underworld." Then, should, according to the Maya, the development of the earth / humanity to be completed. But what comes next? If the whole earth will be destroyed or it will "only" be with humanity to an end? If the underworld then the 5th Age to start over again, without us humans?
Third The Maya expected the return of the gods (today we would call them aliens). Now, some claim, such as Erich von Daniken, that this will happen on the day of expiry of last underworld and the heavens and the last of the Long Count Calendar.

What exactly should happen on 12/21/2012, tell us the
Maya and their calendar is not. Unfortunately, by the Spanish
Discoverer of many legacies of the Maya destroyed
been. Perhaps we would then have the answer now.

But the fact is that

First on 21.12.2012 of the Long Count calendar has its last day before he starts from scratch.
Second the last underworld and the sky last end on 21.12.2012.
Third The Maya expected the return of their gods.
4th Maya the exact an incredible, complex astronomical knowledge had.