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Scientists have been wringing their hands over the possibility of asteroid Apophis crashing into the planet, but new data from a distant flyby diminishes the chances of an Earth impact.
Speaking at the Human to Mars Summit, NASA's top administrator, Charles Bolden, pledges to work to "prevent an asteroid from colliding with devastating force into our planet."
Asteroid Apophis is expected to make a close encounter with Earth in 2029 and could be even closer in 2036.
If a meteor similar to the one that hit in Russia was on a path toward New York, we might be lucky to get even three weeks' warning, NASA's Charles Bolden Jr. says at a House Committee hearing.