We don't have the accuracy yet to determine the magnitude of the average global trend, but we at least are trying to point out the signs of these trends.
"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.
"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.