Did an asteroid hit it, blasting the greater part of its atmosphere into space?
That could happen again, with the economic equivalent of an asteroid coming out of the blue.
We are more likely to win the lottery twice than to be hit by an asteroid.
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The Moon acts like an asteroid magnet and has been aggregating asteroids for billions of years.
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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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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.
But over time, it's an important consideration when trying to understand where an asteroid is headed.
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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Some NASA planners theorize that an astronaut crew could help divert an asteroid from its collision course.
One day this information could be used to help move an asteroid out of an Earth-impacting orbit.
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That the dinosaurs were killed off 65m years ago by an asteroid impact is now widely accepted.
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Last year, President Barack Obama said he wants the space agency to land astronauts on an asteroid by 2025.
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Little is known in terms of what exact materials make up an asteroid.
However the practicalities of landing a spacecraft to monitor, explore or deflect an asteroid still face a number of challenges.
The president has previously said that he wants to send astronauts to an asteroid for the first time by 2025.
In October, NASA astronauts started rehearsing an asteroid mission in an underwater laboratory off the coast of Key Largo, Fla.
An asteroid strike would have scoured much of the earth of its vegetable cover, and provided a paradise for ferns.
In Entropia, which is an asteroid, Panasjuk is the avatar John "Foma" Kalun, who has been a player for a decade.
The delay simulates the time it would take real signals to travel many millions of km across space from an asteroid.
President Barack Obama has set Nasa the target of landing a crew on an asteroid in 2025, or very soon after.
Because people had seen silly films about an asteroid strike, they seem to bracket the threat alongside giant marshmallow men.
After an asteroid passed close to Earth last week, scientists in California have proposed launching solar-powered lasers to vaporize incoming asteroids.
Professor Mark Bailey of Armagh Observatory in Northern Ireland said an asteroid of that size could have devastating effects on the Earth.
OSIRIS-REx will visit an asteroid called 1999 RQ36, take a sample of at least 2.1 ounces and bring it back to Earth.
This is the first time the density of an asteroid has been measured so directly, and the low result is an embarrassment.
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