this post was submitted on 12 Oct 2024

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1212

Where does the music go? (mander.xyz)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] [email protected] 21 points 1 month ago (4 children)

Don’t forget the inverse square law. Even without a change in medium or any obstacles, the strength of the signal decrease over distance until it is undetectable.

This is also why there are no extraterrestrial civilizations hearing any radio broadcasts from Earth. Our transmitters are so weak that any signals we send out fade into the CMB before they get any real distance.

[–] [email protected] 12 points 1 month ago* (last edited 1 month ago) (2 children)

So Lrrr and Ndnd warching Single Female Lawyer 1000 years in the future is a lie?

[–] [email protected] 5 points 1 month ago

They would not have been able to watch it from an original OTA broadcast, no.

[–] [email protected] 3 points 1 month ago (1 children)

Unless they have an extensive network of wormhole repeateds

[–] [email protected] 2 points 1 month ago

They've probably just got a spy satellite around earth that transmits back. Or maybe an extremely directional antenna / receiver dish would work, since they're focused on Earth specifically.

[–] [email protected] 9 points 1 month ago (1 children)

You area conflating auditory waves with radio waves.

These are very much not the same thing. Sound waves require a medium while radio waves do not.

Radio waves travel vast distances through space while sound doesn't travel at all.

[+] [email protected] -6 points 1 month ago (1 children)

Space is a medium, as exemplified by the fact that light curves around massive objects, because the space is curved.

[–] [email protected] 10 points 1 month ago (1 children)

Space isn't a medium because mediums have privileged frames of reference.

You're talking about spacetime which is a field, not a medium.

[–] [email protected] -2 points 1 month ago (1 children)

So you’re saying that light can travel through not-space?

[–] [email protected] 5 points 1 month ago (1 children)

Light is also not "stuff" - it's electromagnetic radiation. It's by the unprivileged intertial frame of reference that we define the speed of light. Light's speed is the speed at which it travels unimpeded through the spacetime "field". Additionally light does not accelerate or change speed in any way while traveling in that frame.

Unless you're asking if light travels through things that are not the field known as the spacetime continuum in which case yes: light travels (and changes speed) through all sorts of materials. Like glass.

[–] [email protected] 1 points 1 month ago

Don't materials also need to exist in space?

[–] [email protected] 6 points 1 month ago

If they didn't fade with distance, this is as far as they have gotten. So for now we are still quiet in the dark forest.

[–] [email protected] 4 points 1 month ago

If we had FTL I'd be a radio archaeologist, flying out to various distances to attempt to capture lost episodes of old TV shows like Doctor Who