Question: who propounded the nebular hypothesis for the origin of the earth
[{'answer': 'Immanuel Kant', 'provenance': [{'wikipedia_id': '212374', 'title': 'Nebular hypothesis', 'start_paragraph_id': 1, 'start_character': 280, 'end_paragraph_id': 1, 'end_character': 293, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '212374', 'title': 'Nebular hypothesis', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1046, 'bleu_score': 0.9711489523772141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 109537719652223966}, 'section': 'Section::::Abstract.'}]}]