Question: when did the earth and solar system form
[{'answer': '4.6 billion years ago', 'provenance': [{'wikipedia_id': '6139438', 'title': 'Formation and evolution of the Solar System', 'start_paragraph_id': 1, 'start_character': 54, 'end_paragraph_id': 1, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6139438', 'title': 'Formation and evolution of the Solar System', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 360, 'bleu_score': 0.9669306597086381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14263305359476594774}, 'section': 'Section::::Abstract.'}]}]