Trillions of comets collide around Fomalhaut

Posted by Kate Taylor
A ring of dust around the nearby star Fomalhaut is created by the collision of thousands of comets every day.
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Ridge on Saturn's moon created as ring slammed into the equator

Posted by Emma Woollacott
In the five years since Cassini released images of a bizarre ridge encircling the equator of Saturn's moon Iapetus, astronomers have struggled for an explanation.
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