Question: Which planet was first discovered by Johann Gottfried Galle?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri prop:discoverer <http://dbpedia.org/resource/Johann_Gottfried_Galle>  . ?uri rdf:type onto:Planet}