Renowned astrophysicist Carl Sagan once described a "baloney detection kit" — a set of tools that skeptical thinkers use to investigate any new concept. A few of the key tools include a healthy distrust of information that isn't independently verified, critically assessing an idea rather than becoming irrationally attached to it simply because it's intriguing, and a preference for simple explanations over wildly speculative ones.

The waxing obsession with the planet Nibiru , which conspiracy theorists say is a planet swinging in from the outskirts of our solar system that is going to crash into Earth and wipe out humanity in 2012 — or, in some opinions, 2011 — shows that an astonishing number of people "are watching YouTube videos and visiting slick websites with nothing in their skeptical toolkit," in the words of David Morrison, a planetary astronomer at NASA Ames Research Center and senior scientist at the NASA Astrobiology Institute.

Morrison estimates that there are 2 million websites discussing the impending Nibiru-Earth collision. He receives, on average, five email inquiries about Nibiru every day.

"At least a once a week I get a message from a young person — as young as 11 — who says they are ill and/or contemplating suicide because of the coming doomsday," Morrison told Life's Little Mysteries, a sister site to SPACE.com.

What's the origin of this mass panic about Nibiru, which astronomers say doesn't exist?

The idea that doomsday will result from a planetary collision was first proposed in 1995 by Nancy Lieder, a self-described "contactee." Lieder claims she has the ability to receive messages through an implant in her brain from aliens in the Zeta Reticuli star system. On her website, ZetaTalk, she stated that she was chosen to warn mankind of an impending planetary collision which would wipe out humanity in May 2003. 

(When no such cataclysmic event occurred, Lieder's followers chose 2012 as the new date for the Nibiru collision, which coincides neatly with other doomsday prophecies focused on the ending of the Mayan calendar.) 

Lieder originally called the bringer of doom "Planet X," and later connected it to a planet that was hypothesized to exist by a writer named Zecharia Sitchin in his book "The 12th Planet" (Harper 1976). According to Sitchin (1920-2010), the ancient Sumerians wrote about a giant planet called Nibiru — the "twelfth planet" in the solar system, after the other planets (including Pluto), the sun and moon — which has an oblong orbit that swings near Earth every 3,600 years. Humans actually evolved on Nibiru, he said, and colonized this planet during a previous flyby.

Historians and language scholars say that Stitchin grossly mistranslated ancient texts. The Sumerians did indeed believe in a cosmology involving planets; however they thought there were five planets, not 12, and they did not believe that humans hopped to Earth from a place called Nibiru. 

Furthermore, astronomers have pointed out that a planetary orbit like the one Sitchin proposed for Nibiru is impossible: No celestial body could maintain a stable orbit that swings it through the inner solar system every 3,600 years and keeps it beyond Pluto the rest of the time. The body would quickly get sucked in or pushed out.

Nonetheless, Sitchin's books have been translated into 25 languages and sold millions of copies worldwide. Lieder's planetary collision theory has adopted the name of Nibiru for Earth's planetary nemesis. Many people who believe that doomsday will occur when the Mayan calendar ends in 2012 have adopted Lieder's Nibiru collision prophecy as the cataclysm that will bring us to that end.

The "fact is that these folks are constantly changing their story," Morrison wrote in an email. "For some, Nibiru is no longer the Sumerian god or planet that is supposed to be returning to Earth in late 2012. It has become a catchword for almost any cosmic catastrophe."

Internet rumors about Elenin began spreading earlier this year. Its approach to Earth was blamed for shifting the Earth's axis by 3 degrees in February, precipitating the Chile earthquake, then shifting the pole even more to trigger the Japan quake in March. "Ignoring plate tectonics as the cause of earthquakes, they suggest that the comet exerted strong gravitational or electromagnetic effects on our planet," Morrison wrote.

When scientists pointed out that the comet is a mere 3-mile-wide glob of ice with no magnetic field and that it won't even pass very near Earth — and that plate tectonics, not comets, cause earthquakes — rumors began to circulate that NASA was withholding information about Elenin.

"Ironically, the inconspicuous nature of this comet plays into some of the conspiracy theories," Morrison pointed out. "For people who are convinced the comet did cause the earthquakes, this proves that Elenin is not a comet at all, but a much more massive, and dangerous, interloper." 

(Source: Space.com)