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BBC NEWS | Science/Nature | Fire in the sky: Tunguska at 100

This is a story about the Russia explosion,,by a comet or asteroid about 100 years ago, toward the end of the story it gets even scarier.

Many observers are concerned by what they regard as a lack of action to counter the threat posed by near-Earth asteroids.

California-based space advocacy group the Planetary Society recently awarded an Atlanta-based aerospace company $50,000 (£25,000) to design a spacecraft which could rendezvous with and track the path of the asteroid 99942 Apophis.

In 2029, this 270m-wide chunk of cosmic debris will closely approach the Earth – so close, in fact, it will be visible with the naked eye.

If this primordial behemoth passes through a precise region in space, or “keyhole”, several hundred kilometres wide during this pass, it will strike Earth in 2036.

BBC NEWS | Science/Nature | Fire in the sky: Tunguska at 100

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