Question: Which astronauts went on the Gemini 8 mission?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/mission> <http://dbpedia.org/resource/Gemini_8> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Astronaut>}