Hong-Sheng Zhao of Leiden University in the Netherlands calculates that a close encounter with another one of the Milky Way's satellites, the Large Magellanic Cloud, could have knocked Sgr into a closer orbit two or three billion years ago.

ECONOMIST: The galactic gourmand

Before his political career, he taught at the University of Ghana and also was a visiting lecturer at Temple University in Pennsylvania and Leiden University in the Netherlands.

CNN: Ghana mourns as President John Atta Mills is buried