==Events==
* German physicist Theodor Wulf climbs the Eiffel Tower with an electrometer and discovers the first evidence of [[Astronomical_Terms_Database#C|cosmic rays]].
* The first public radio broadcast takes place from the ''Metropolitan Opera House'' in New York.
* Infrared photographs are first published in the Royal Photographic Society's journal.
* '''[[October 19]]''' - – Birth of Subrahmanyan Chandrasekhar, Indian-born astrophysicist. <br> He was awarded the Nobel prize ([[1983]]) in physics for his studies on the physical processes important to the structure and evolution of stars.
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! colspan="3" | [[Timeline]]
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| <center>[[1909]] || <center>[[1910]] || <center>[[1911]]
|-
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