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'Exocomet' numbers nearly tripled in new study


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A new haul of comets around distant stars has been unveiled, more than doubling the number we know of.


The first such "exocomet" was discovered in 1987 but since then only three more had been found.


At the 221st American Astronomical Society meeting in the US, astronomer Barry Welsh gave details of seven more.


Proving that comets are common in the Universe has implications for their role in delivering water or even the building blocks of life to planets.


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