The Mayans, just so you know, didn't predict anything.
New Agers have attached a 'transformational event' to a date in the Mayan calendar because that's what they do.
Doomsday predictors, having been proved wrong in 2003, then changed their prediction (let's look closely at that sentence) to 2012, also attaching their fantasy to a date in the Mayan calendar because that's what they do.
For some reason, dead Stone Age Mesoamerican cultures have an 'ooh!' factor when it comes to understanding the universe, despite not managing to invent the wheel.
The actual cataclysm being spoken of is a collision with 'planet Nibiru', which doesn't exist. The cataclysm was first mentioned in 1995 by Nancy Lieder, who says she receives messages from extra-terrestrials from the Zeta Reticuli star system through an implant in her brain.
She claimed 'Planet X', as she called it at the time, was going to collide with us while denying comet Hale-Bopp was real.
In 2003 Lieder had her own dogs put down so as to save them suffering during the cataclysm, and to provide herself with food in the chaos afterwards. She went on the radio in LA to advise everyone else do the same. Think about that for a minute.
In 1996 Lieder associated Planet X with planet Nibiru, which pseudo-scientist Zecharia Sitchin claimed was mentioned in ancient Babylonian texts but not one scholar has ever backed up.
|That dot there, apparently. Except no.|
Sitchin denied any connection between Nibiru and Lieder's claims. He said fictional Nibiru will pass us by in 2900AD. However, he did claim aliens called the Annunaki might come to Earth in 2090AD.
Here's some science to wash your brain clean.