Billions of years before the Sun was born, the Milky Way galaxy flicked out its gravitational tongue and slurped down a tiny neighboring galaxy that had ventured too close. The evidence for that ancient act of cosmic cannibalism is the still-digesting remains of the meal: a handful of relatively nearby stars known as the Helmi Stream, whose weird orbits — above and below the plain of the galaxy — are a tipoff to their weird origin. Now one of those stars has a second claim to fame. HIP 13044, as it's unglamorously known, has a planet whirling around it — the first planet ever found from outside the Milky Way. Aside from its extra-galactic origin, the planet itself, found with a medium-size telescope at the European Southern Observatory in Chile, and described in a new paper in Science, isn't especially remarkable. It's a bit bigger than Jupiter and orbits its parent star in about 16 days — a “year” so short it would once have been considered impossible for so giant a planet, until multiple discoveries of many similar worlds proved such a revolution rate to be pretty common http://www.time.com/time/health/article/0,8599,2032054,00.html added by: unimatrix0
