Question: how many astronomers are there in the united states
[{'answer': 'approximately 7,000', 'provenance': [{'wikipedia_id': '580', 'title': 'Astronomer', 'start_paragraph_id': 6, 'start_character': 202, 'end_paragraph_id': 6, 'end_character': 221, 'bleu_score': 1.0, 'section': 'Section::::Academic.\n'}]}, {'provenance': [{'wikipedia_id': '580', 'title': 'Astronomer', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 551, 'bleu_score': 0.92959410412591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12220075066871321978}, 'section': 'Section::::Academic.\n'}]}]