Question: who developed the modern model of the solar nebular disk instability model
[{'answer': 'Victor Safronov', 'provenance': [{'wikipedia_id': '212374', 'title': 'Nebular hypothesis', 'start_paragraph_id': 10, 'start_character': 145, 'end_paragraph_id': 10, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '212374', 'title': 'Nebular hypothesis', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 819, 'bleu_score': 0.9078641172925621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16525794871196753184}, 'section': 'Section::::History.\n'}]}]