UK Infrared Telescope discovers 'impossible' binary stars
A team of astronomers have used the United Kingdom Infrared Telescope (UKIRT) on Hawaii to discover four pairs of stars that orbit each other in less than 4 hours. Until now it was thought that such close-in binary stars could not exist. The new discoveries come from the telescope’s Wide Field Camera (WFCAM) Transit Survey, and appear in the journal Monthly Notices of the Royal Astronomical Society.
Sverre Aarseth's research into numerical simulations of many-body (N-body) gravitational interactions has developed into a set of FORTRAN codes which describe the dynamics very closely, and freely downloadable.