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    The apocalypse as a plotline

    • End of calendar1
    • Planetary alignments2
    • Collision with planet3
    • Solar storm4
    • Axis shift5
    • So, now what?6
    Mayans
    End of the Maya calendar
    By studying the movement of stars, planets, the sun, and the moon, the ancient Maya created multiple calendars that tied natural phenomena in their world to the alignment of objects in the cosmos. Decisions about farming, celebrations, war, and politics were connected to these timed cycles. The long-count calendar, created to document extended periods of time and to record dates for event comparison, expires on Dec. 21. Pop culture has interpreted this date as heralding an apocalyptic event.

    How the long-count Maya calendar will read on Dec. 21
    (The end of the long-count cycle is similar to a car's odometer turning over when it reaches 100,000 miles.)

    Mayans
    Earth-shattering planetary alignments
    Theory
    During the 2012 winter solstice, the sun and Earth will align with the center of the Milky Way galaxy. The gravitational pull from an enormous black hole in the galactic center will stress Earth to the extreme, creating massive earthquakes, volcanoes, and tsunamis that will destroy civilization.

    Reality
    There are no planetary alignments on Dec. 21. The Earth, sun, and Milky Way alignment is an annual event of no consequence: The galactic center is too far away to stress our planet. Only the nearby moon and sun can affect tides.
    Mayans
    Collision with planet Nibiru
    Theory
    The supposed enormous planet, allegedly discovered by the ancient Sumerians, was expected to collide with Earth in May 2003. When it didn't, the doomsday event was linked to the end of the long-count period of the Maya calendar. Other celestial objects have also been said to be on a collision course with Earth.

    Reality
    If a planet or celestial object were on a collision course with Earth, the thousands of astronomers who scan the skies every night would have seen it.
    Mayans
    A solar storm like no other
    Theory
    A giant solar storm, with huge solar flares, will erupt into space and emit gamma rays so powerful they will knock out satellites that drive the world's financial, transportation, and communication systems. It's a doomsday prepper's nightmare: Some fear the ensuing pandemonium will shut down civilized society as survival instincts kick in and turn humans into the planet's most dangerous beasts.

    Reality
    Solar storms generally follow solar cycles, which peak every 11 years. The next peak is predicted for mid-2013 and is expected to be mild. In addition, new satellites are being designed to protect electronics against most solar storms.
    Mayans
    Our axis or magnetic field will shift
    Theory
    Earth's axis will do a 180 rotation around the core and cause a new Ice Age. Or Earth's magnetic north will flip suddenly and cause the planet's destruction.

    Reality
    An axis shift would indeed affect our climate dramatically, but it won't happen: The orbit of the moon around Earth stabilizes it and prevents the shift. Magnetic field shifts occur slowly, with complete pole reversals about every 200,000 to 300,000 years. Geographic and fossil records on past reversals indicate no change in plant or animal life.
    Mayans
    So, now what?
    Of course, what you plan to do on this date depends on what you believe. Recently, 1 in 10 people surveyed in an international poll felt Earth would end with the end of the Maya calendar. And, perhaps, preparing for total destruction requires no preparation at all. For the other 90 percent . . .


    Before Dec. 21
    Take a moment to consider what if it really were the end of the world. What would you do in these last days? With whom would you spend your time? Take the opportunity to appreciate and reflect.


    On Dec. 21
    Try not to look up. Hug the kids. Breathe a sign of relief when the day's over, even if you didn't entertain the thought, not even for a moment, that the world could end.


    The day after
    Celebrate the start of a new Maya long-count calendar with friends and family. Consider it a bonus New Year's event, and plan big: If you miss this one, you'll have to wait until 7137 for another chance.

    James Abundis, Chiqui Esteban, Javier Zarracina/Globe Staff