2020 ⟶ Arecibo Observatory's Radio Telescope Collapses
December 1: The Arecibo Telescope of the Arecibo Observatory...
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2020
📞 First Commercial Telephone Exchange Established
First commercial telephone exchange in New Haven, Connecticut.A barricade in the Paris Commune, 18 March 1871. Around 30,000 Parisians were killed, and thousands more were later executed.⟶
CommunicationInfrastructure
United States🏞️ Hoover Dam Completed
🔭 Discovery of the First Millisecond Pulsar
Donald C. Backer et al. discover the first millisecond pulsar⟶
AstronomyAstrophysicsRadio AstronomySpace ExplorationCosmology
United States📡 Ciena and Sprint Deploy First Commercial DWDM System
The Ciena Corporation, in partnership with Sprint, deployed the first commercial dense wavelength-division multiplexing system, which created the massive capacity of the Internet.⟶
InternetTelecommunicationsInfrastructureNetworking
United States📡 Arecibo Observatory's Radio Telescope Collapses
December 1: The Arecibo Telescope of the Arecibo Observatory collapses, just weeks after the announcement of its planned demolition.⟶
AstronomyRadio AstronomySpace ExplorationInfrastructure
United States