ASK WHERE { <http://dbpedia.org/resource/Neptune> <http://dbpedia.org/property/discoverer> <http://dbpedia.org/resource/Johann_Gottfried_Galle> }
Did Johann Gottfried Galle invent Neptune?
ASK WHERE { resource:Neptune property:discoverer resource:Johann_Gottfried_Galle }
Yes
[Yes], Johann Gottfried Galle is the discoverer of Neptune.
Yes,  Johann Gottfried Galle is Newcastle's discoverer.