Titlebook: Classifying the Cosmos; How We Can Make Sens Steven J. Dick Book 2019 Springer Nature Switzerland AG 2019 classification in astronomy.astro

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The Protoplanetary Familymation, when a protostar (S 1) condenses out of a molecular cloud (S 25). The central star is believed to be a T Tauri or higher mass object known as a Herbig Ae/Be star (S 2 and S 3) where planets have not yet had time to accrete. Recent research indicates that in massive starburst clusters such as

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