What Happened around 1950?

HR Diagram comes into focus

• Globular cluster stars clearly very old (>few Gyr)
• T Tauri and other ìpre-main-sequenceîstars clearly very young (few Myr)
• Real admitted need for star formation

Radio Astronomy finds the Neutral ISM

1951 Ewen & Purcell detect 21-cm emission from interstellar hydrogen out the window of Harvardís Jefferson Labs (appreciated as massive amounts of gas, but not concentrated on Bok GlobulesÖ)

$ NSF Founded $ (1950) (Keep in mind...NASA Founded 1958)

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