https://astronomie-nord.de/author/stephan-bruegger/https://astronomie-nord.de/author/frank-thannhaeuser/https://astronomie-nord.de/author/gva-hamburg/https://astronomie-nord.de/author/hartwig-luethen/https://astronomie-nord.de/author/joshua-koch/https://astronomie-nord.de/author/juergen-kahlhoefer/https://astronomie-nord.de/author/julia-resch/https://astronomie-nord.de/author/klaus-ammann/https://astronomie-nord.de/author/torsten-lohf/https://astronomie-nord.de/author/marco-ludwig/https://astronomie-nord.de/author/orzeadmin/https://astronomie-nord.de/author/robert-schumann/https://astronomie-nord.de/author/schomannadmin/https://astronomie-nord.de/author/stefan/https://astronomie-nord.de/author/sternwarte/https://astronomie-nord.de/author/sternwarte-luebeck/https://astronomie-nord.de/author/vhs-sternwarte-neumuenster/