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National geographic society – palomar observatory sky survey
astronomical survey, that took almost 2,000 photographic plates of the night sky
Pronunciation
/ˈnæʃənəl ˌʤiəˈgræfɪk səˈsaɪədi – ˈpæləmɑr əbˈzərvəˌtɔri skaɪ ˈsərˌveɪ/
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astronomical survey