Asteroid Apophis- No Worries

  The possibility of a 2036 impact from asteroid Apophis has been ruled out, according to NASA's Jet Propulsion Laboratory.

 Cool. Wait, what?!

 Didn't know there was a possibility of an asteroid impact in the relatively near future? Your probably not the only one.
 99942 Apophis was discovered in 2004, and immediately caught the attention of scientists because initial observations indicated the possibility of an impact in the year 2029. After further observation, the asteroid's probablility of striking Earth was ruled out.
 However, the close approach of Apophis in 2029 will significantly alter the asteroid's trajectory, and scientists were uncertain of what would happen when Apophis returns in 2036. Until yesterday.
 Using data gathered in 2011 and 2012, as well as new data from the asteroid's flyby on January 9th, it has been determined that the risk of impact in 2036 is pretty remote.
 Apophis is around 1000ft in diameter, and an impact from an asteroid this size would release an energy eqivalent to about 500 megatons of TNT. The largest nuclear weapon detonated in human history was 50 megatons. A strike on land would obliterate hundreds of square miles and an impact in the ocean would generate a mega tsunami. Still, Apophis is not big enough to cause an extinction level event.
 When Apophis performs it's Earth flyby in 2029, it will be well within the orbit of the moon when it comes no closer than 20,000 miles from the Earth's surface. It will be visible to the naked eye.

http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130110.html