[Geology2] Comets may have come from other solar systems

* Comets may have come from other solar systems:
Many of the best known comets may have been born orbiting other stars,
according to a new theory.
http://www.world-science.net/othernews/100610_comets

Also:

* Off-kilter planetary system surprises astronomers:
http://www.world-science.net/othernews/100524_planet

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