Thousands of unseen dark comets may be on collision course with Earth, warn experts

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Thousands of invisible 'dark' comets may be posing an unseen threat to Earth, according to two British astronomers.

A 'dark' comet is one which has shed its bright water ice, leaving an inner organic crust that reflects only a small fraction of light.

Because it does not glow, a dark comet on collision course with the Earth could easily escape detection until disaster looms.

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