Question: who proposed elliptical orbit of the planets around sun
[{'answer': 'Johannes Kepler', 'provenance': [{'wikipedia_id': '17553', 'title': "Kepler's laws of planetary motion", 'start_paragraph_id': 5, 'start_character': 232, 'end_paragraph_id': 5, 'end_character': 247, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17553', 'title': "Kepler's laws of planetary motion", 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 366, 'bleu_score': 0.847380121393936, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16994325579051644031}, 'section': 'Section::::Abstract.'}]}]