| For those that had anxiety about the end of times related to the Mayan calender, we have something new to worry about.
Astronomers are gearing up in 2013 when Earth gets buzzed by two rogue asteroids and two comets, including a wanderer last seen before man walked the earth.
Scientists are tracking an asteroid called 99942 Apophis, named after the god of evil and darkness in Egyptian mythology.
Early calculations suggested a 2.7-percent probability of a collision in 2029, the highest ever seen for an asteroid, but the risk was swiftly downgraded after more observations.
NASA's Jet Propulsion Laboratory (JPL) puts the risk at about one in 250,000.
NASA's deep-space radars at Goldstone, in California's Mojave desert, and at Arecibo in Puerto Rico will be scanning Apophis, which on January 9 will pass by at some nine million miles.
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