| Max-Planck-Institut für Radioastronomie |
| A German institute for research in radio astronomy which has its headquarters in Bonn and an observing station at Effelsberg, 40 kilometres (25 miles) to the south-west of Bonn. The observatory operates a 100-metre (328-foot), fully steerable radio dish on a computer-controlled altazimuth mounting, which was opened in 1971. |