Serving Astronomy for 50 years – the anniversary of the 100-m Radio Telescope in Effelsberg

2021 marked the fiftieth anniversary of the inauguration of the radio telescope in Effelsberg. In the past decades, the telescope, whose construction broke new technical ground, has produced numerous important observational results. Thanks to constant improvements and renewals it is still state-of-the-art. Selected current observational projects are presented here.