Question: who discovered the sun was the center of the solar system
[{'answer': 'Aristarchus of Samos', 'provenance': [{'wikipedia_id': '244588', 'title': 'Heliocentrism', 'start_paragraph_id': 1, 'start_character': 325, 'end_paragraph_id': 1, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]