Scientists have warned that 'dark comets' could pose a threat to the Earth and that we won't be able to detect them. A comet becomes 'dark' when the reflective water ice has evaporated leaving only the dark nucleus. Scientists believe that comets as oppose to asteroids were responsible for many of the world's ancient impacts.
"Swathes of dark comets may be prowling the solar system, posing a deadly threat to Earth."
View: Full article | Source: New Scientist
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