Question: who is the first person to classified galaxies into groups according to their structure
[{'answer': 'Edwin Hubble', 'provenance': [{'wikipedia_id': '12558', 'title': 'Galaxy', 'start_paragraph_id': 30, 'start_character': 214, 'end_paragraph_id': 30, 'end_character': 226, 'bleu_score': 1.0, 'section': 'Section::::Observation history.:Distinction from other nebulae.\n'}]}, {'provenance': [{'wikipedia_id': '12558', 'title': 'Galaxy', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 562, 'bleu_score': 0.9516391630120881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15938471620980305632}, 'section': 'Section::::Observation history.:Distinction from other nebulae.\n'}]}]