Older Than deck / Events and discoveries
Cosmic rays
Shown by Victor Hess
1912
Hess carried detectors up in a balloon and found radiation coming from space.
Sources and checks
Checked 2026-11-01: Researched by Codex (two independent publishers, verbatim quotes); every counted quote re-found on its page by the server check (content-verify, or content-verify-pdf for PDFs); scope and plausibility reviewed by Claude (AI build agent). Quotes are short passages from each source; for dates the quote is the year as printed, read in context.
“Victor Franz Hess (1883-1964) discovered cosmic rays in 1912.”University of Innsbruck — original Victor Franz Hess Observatory biography: source, retrieved 2026-10-30; quote re-found by the server check
“In the Bohemian town of Aussig on 7 August 1912”American Institute of Physics, Physics Today — Per Carlson's original historical review: source, retrieved 2026-10-30; quote re-found by the server check
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