The year 1929 in science and technology involved some significant events, listed below. == Astronomy and space exploration == July – Henry Norris Russell publishes his finding that hydrogen is the principal constituent of stars, acknowledging the previous demonstration of this by Cecilia Payne.
The year 1929 in science and technology involved some significant events, listed below. == Astronomy and space exploration == July – Henry Norris Russell publishes his finding that hydrogen is the principal constituent of stars, acknowledging the previous demonstration of this by Cecilia Payne.
Source: Wikipedia "1929 in science" · CC BY-SA 4.0
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