What is <source of energy> of <heat> ?
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hat is the source of energy for this heat?
SELECT DISTINCT ?x WHERE { ?x property:source_of_energy resource:heat }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P618> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q44432>. }
select distinct ?answer where { ?answer wdt:P618 wd:Q44432}
photon rocket