They caught sight of the asteroid after its last pass, at a far greater distance.
Asteroid 99942 Apophis is a primordial relic from the formation of our Solar System.
This would involve launching a spacecraft able to give the asteroid a nudge to change its orbit.
Did an asteroid hit it, blasting the greater part of its atmosphere into space?
The last one happened 65 million years ago when a large asteroid crashed into the Earth.
Asteroid strikes and nuclear war are, from memory, two of the examples he uses.
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That could happen again, with the economic equivalent of an asteroid coming out of the blue.
The company's first asteroid launch was scrapped in January and has been put off indefinitely.
NEAR-Shoemaker was then able to produce a "fingerprint" of the asteroid's chemical makeup, mission scientists said.
The asteroid tugboat idea was developed by Schweickart and his team at Foundation B612.
Advances here will inform the more scifi-ish imponderables like a space elevator, and asteroid- or moon-mining.
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We are more likely to win the lottery twice than to be hit by an asteroid.
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Friday's Chelyabinsk meteor came on the same day that a hefty asteroid charged past Earth.
There are exceptions, like the massive asteroid that many experts believe killed off dinosaurs.
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The Moon is saturated with craters, caused by billions of years of asteroid bombardment.
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The Moon acts like an asteroid magnet and has been aggregating asteroids for billions of years.
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Early on, Moskovitz says the entire solar system probably resembled one giant asteroid belt.
The question is, how do we co-ordinate an asteroid early warning system at the global level?
Essentially, deliver an asteroid into Earth orbit and drop a wire down from it.
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Comprised of silicate rock, the asteroid rolls through its eccentric orbit like a tumbling potato.
Eros was named by German astronomer Gustav Witt, who discovered the asteroid in 1898.
The close fly-by of an asteroid like DA14, like the Tunguska meteor, is a once-in-1, 000-years event.
The close fly-by of an asteroid like DA14, like the Tunguska meteor, is a once-in-100-years event.
Vesta and Ceres are the two most massive objects in the main asteroid belt.
But over time, it's an important consideration when trying to understand where an asteroid is headed.
"The asteroid event is typically thought of as affecting the dinosaurs primarily, " he said.
We believe it to be primarily as a by-product of an overall asteroid processing industry.
When part of an asteroid's surface passes from night to day, it starts to warm up.
So how much warning will we really have if an asteroid is about to hit Earth?
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One difference between Eros and ordinary meteorites, however, is that the asteroid is not magnetic.
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