Carl Sagan on Radio Waves #astrophysics #carlsagan #youtubeshorts
Channel: ASTROMATHICS
Date: 21/03/2024

They travel vast distances: Radio waves, a form of electromagnetic radiation, can indeed travel enormous distances through space. Unlike sound waves, they don't require a medium to propagate. This allows them to traverse the near-vacuum of space with minimal interference.

Forever isn't quite right: However, radio waves aren't entirely indestructible. Several factors can weaken or even destroy them over time:

Expansion of space: As the universe expands, the wavelength of the radio wave gets stretched, reducing its energy.
Interaction with matter: If they encounter dust, gas, or other matter in space, radio waves can be absorbed or scattered, losing their strength.
Black holes: The immense gravity of black holes can trap even light and radio waves.

Traces remain: Even if the original signal weakens significantly, it doesn't completely disappear. Depending on the power of the original transmission and the distance traveled, there might still be a faint echo detectable by powerful telescopes.

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