Question: Was Ganymede discovered by Galileo Galilei?
SPARQL query: ASK WHERE { <http://dbpedia.org/resource/Ganymede_(moon)> <http://dbpedia.org/property/discoverer> <http://dbpedia.org/resource/Galileo_Galilei> }
Answer: [Yes], Galileo Galilei is the discoverer of Ganymede.