Question: what was the purpose of the voyager 2 mission
[{'answer': 'study the outer planets', 'provenance': [{'wikipedia_id': '32782', 'title': 'Voyager 2', 'start_paragraph_id': 1, 'start_character': 67, 'end_paragraph_id': 1, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32782', 'title': 'Voyager 2', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 357, 'bleu_score': 0.927342992183329, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10646219761794745791}, 'section': 'Section::::Abstract.'}]}]