Planets from long ago puzzle astronomers

As­tro­no­mers have iden­ti­fied a plan­e­tary sys­tem that they de­scribe as a likely sur­vi­vor from one of the earliest cos­mic times, 13 bil­lion years ago. The sys­tem, they say, con­sists of a star dubbed HIP 11952, and two plan­ets that or­bit it eve­ry 290 and sev­en Earth days, re­spec­tive­ly.