What did Antonio Paris hypothesize was the true source causing the strong, narrowband signal mimicking an alien beacon?

Answer

A comet passing through the telescope's field of view

Astronomer Antonio Paris proposed a natural terrestrial explanation for the signal, centering on the transient activity of a comet. Comets, as they approach the sun, undergo outgassing, releasing large clouds of dust and gas. If a sufficiently large and nearby comet was emitting vast amounts of hydrogen gas, this gas would naturally emit radio waves at the precise 1420 MHz frequency. This process could create a strong, narrowband signal that perfectly mimics the characteristics SETI researchers seek, providing a potential non-intelligent source for the 1977 detection.

What did Antonio Paris hypothesize was the true source causing the strong, narrowband signal mimicking an alien beacon?

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