Case file · High strangeness
Tesla's 'signals from another world'
Working at his Colorado Springs laboratory in 1899, Nikola Tesla picked up rhythmic radio signals he came to believe were messages from another planet, which he described in a December 1899 letter and in print in 1901.
1899 CE · 38.82, -104.82 · status: explained
The sceptical view
Historians suggest he heard Marconi's transmissions, natural radio emissions or Jupiter's radio bursts; no other station recorded the 'message'.