Who Sent the Echo Back

追加: 2026-05-21

[00:00:00]In the 1920s, [music] radio operators began reporting something impossible. They would transmit a signal across the world, then hear it return seconds later. Not milliseconds, seconds. An ordinary radio echo should bounce back almost instantly.

[00:00:15]>> [music] >> Radio waves travel at the speed of light. A delay of several seconds meant the signal had traveled an impossible distance. The phenomenon became known as long delayed echoes, LDEs. Some echoes returned after 3 seconds, others after 15, some after nearly a minute, [music] which raised a terrifying question.

[00:00:35]Where exactly were the signals going?

[00:00:38]Scientists [music] proposed explanations. Signals bouncing off the ionosphere, charged [music] plasma clouds, magnetic disturbances around Earth, but none fully explained the longest delays.

[00:00:51]Then, >> [music] >> the mystery deepened.

[00:00:54]In 1928, Norwegian engineer Jørgen Hals carefully documented strange delayed echoes while operating radio equipment across Europe.

[00:01:03]Decades later, astronomer Duncan Lunan controversially suggested some echo patterns resembled an artificial message mapped [music] through star positions, specifically the Epsilon Boötis system.

[00:01:16]The theory remains heavily disputed.

[00:01:19]Most scientists [music] reject extraterrestrial explanations entirely.

[00:01:23]But the echoes themselves [music] were real, recorded, measured, observed by multiple operators across decades.

[00:01:31]Even today, no single explanation fully accounts for every case, which means somewhere in the history of radio, humanity [music] transmitted signals into the darkness, and something answered later than physics said it should.

[00:01:45]Like and follow Observatory protocol.