"No Earth impact is possible, " according to Don Yeomans, manager of the Near-Earth Object Program Office at NASA's Jet Propulsion Laboratory.

CNN: Russian meteor shower causes blast; hundreds injured

"The meteor was probably about the size of an SUV, " said Donald Yeomans, manager of NASA's Near-Earth Object Program Office at the laboratory, in Pasadena, Calif.

WSJ: Meteor Creates a Show, No Apparent Damage

"We would expect an event of this magnitude to occur once every 100 years, " said Paul Chodas of NASA's Near-Earth Object Program Office, in a statement.

WSJ: Russia Meteor Was Largest in More Than a Century

"We would expect an event of this magnitude to occur once every 100 years on average, " Paul Chodas of NASA's Near-Earth Object Program Office at the Jet Propulsion Laboratory said last week.

CNN: Russian scientists track down fragments of Urals meteor

"We would expect an event of this magnitude to occur once every 100 years on average, " said Paul Chodas, of NASA's Near-Earth Object Program Office at the Jet Propulsion Laboratory in California.

CNN: Russia starts clean-up after meteor strike