Question: what is alpha centauri's approximate distance from earth
[{'answer': '4.37 light - years', 'provenance': [{'wikipedia_id': '1979', 'title': 'Alpha Centauri', 'start_paragraph_id': 1, 'start_character': 154, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '4.37 light - years ( 1.34 pc ) from the Sun'}, {'answer': '4.37 light - years ( 1.34 pc )'}, {'provenance': [{'wikipedia_id': '1979', 'title': 'Alpha Centauri', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5376747224915973519}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1979', 'title': 'Alpha Centauri', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Alpha Centauri (Latinized from α Centauri, abbreviated Alpha Cen or α Cen) is the closest star system and closest planetary system to the Solar System at 4.37 light-years (1.34 parsec) from the Sun', 'Alpha Centauri (Latinized from α Centauri, abbreviated Alpha Cen or α Cen) is the closest star system and closest planetary system to the Solar System at 4.37 light-years (1.34 parsec) from the Sun. It is a triple star system, consisting of three stars: α Centauri A (officially Rigil Kentaurus), α Centauri B (officially Toliman), and α Centauri C (officially Proxima Centauri).']}}]}, {'provenance': [{'wikipedia_id': '1979', 'title': 'Alpha Centauri', 'section': 'Section::::Observational history.\n', 'start_paragraph_id': 39, 'start_character': 753, 'end_paragraph_id': 39, 'end_character': 817, 'bleu_score': 0.634192268377596}]}]