Canonical · Physics & Entropy · Paper
Discovery of the Cosmic Microwave Background
Arno Penzias & Robert Wilson · 1965
"A faint, uniform microwave hiss detectable in every direction of the sky is the cooled-down afterglow of the universe's hot early state — direct physical evidence, not just a mathematical inference, that the Big Bang happened."
Two Bell Labs engineers trying to eliminate radio noise from a satellite antenna in 1965 couldn't get rid of a faint hiss no matter what they cleaned. It turned out to be leftover heat from the birth of the universe.
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Up NextSuggested: Continues the theme of Physics & Entropy
Hubble's Law and the Expanding Universe
"Distant galaxies are receding from us at speeds proportional to their distance — the first hard observational evidence that the universe itself is expanding, which run backward in time implies it began from a single point."
Edwin Hubble · PaperContinue→