Recent comments in /f/space

SimplyZer0 OP t1_jd02fq9 wrote

Reply to comment by solidcordon in The effects of Red Shift by SimplyZer0

Ah okay this clears alot up for me in terms of short space transmission and shows how i can be used some what useful in current day technology, guessing the biggest limitation would be the speed.

Thanks enjoyed this

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Nerull t1_jd01uau wrote

Why would redshift corrupt the data? It just changes the frequency.

If you watch the carrier frequency of a satellite broadcast using a radio spectrum analyzer as it goes overhead you can watch it drift up and down. Satellite comms work just fine.

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solidcordon t1_jczr17z wrote

Reply to comment by SimplyZer0 in The effects of Red Shift by SimplyZer0

OK, so you want to receive a signal from alpha centauri.

There is a tiny red shift for light between here and there due to relative motion of the stars.

The sender would need a pretty powerful laser with a wavelength known to the receiver. They point the laser at the earth and send the message. In astronomical terms, this is not a long distance, the red shift is minimal and the receiver knows the red shift involved and the transmission wavelength of the light. The transmission is also consists of billions of photons all in the same wavelength. Sneding signals over interstellar distances would also involve repeating the message over the course of days with error correction bits.

It would not be a problem to filter out background noise over that range and correct for the minimal red shift.

As long as you are using a highly directional transmitter and know where your receiver is going to be when the signal should arrive, this works fine for distances of many thousands of lightyears. The transmitter power has to be increased to overcome signal attenuation over the distance. The next big problem would be stuff getting in the way. That's unlikely to be a problem under ranges of 100 light years, maybe up to thousands because space is big and mostly empty.

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SimplyZer0 OP t1_jczp5pk wrote

Reply to comment by solidcordon in The effects of Red Shift by SimplyZer0

Okay so you could simply just translate the signal and reciece the data.

a bit like our brain flips the image produced from our eye.

The problem is signal strength.

Okay so now i also have a very basic understanding of quantum superposition and quantum entanglement.

Schrodingers cat explains this very simply. In saying you can have a state that is both one or the other.

Or a 1 or a 0 in binary for example.

Until it is observed it can remain in both states.

But when it is observed it becomes 1 or the other.

Superposition and entanglement was also proved in 2022 nobel prize

If you could have computers that could read information in a quantam state would that fix the issue all together. The issue being data transfer at incredibly long distances in space (4.3 light-years)

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solidcordon t1_jczm9qb wrote

When a signal is redshifted, the redshift will only become problematic for reception if the transmitter is accelerating away from the receiver at a (currently) unachievable rate or varying rate. (as long as your receiving antenna is capable of picking up the redshifted wavelength of the signal).

Varying rate / high acceleration could be factored in to reception with a wide enough spectrum receiving array.

A more significant problem is signal attentuation over the large distance, where the signal strength at the receiver is around the same magnitude of the background noise picked up.

Red shift is "not that strong" for the velocities we've achieved so far.

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boundegar t1_jczm61f wrote

However, the red shift would be extremely small. Any realistic velocity would be a tiny fraction of the speed of light.

Also, light and radio are the same stuff - just a different frequency

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arcosapphire t1_jczkhb3 wrote

It's because he has the technical knowledge to focus on technical aspects. He likes designing rockets, he's happy to get involved with that process and he doesn't make a mess of it.

With Twitter, he doesn't know a damn thing about software architecture at that level or how to manage a social media site. There is no lightning rod to occupy his attention. His interest is literally just in getting to say what he wants and making people read it. And he wasn't part of building Twitter up to what it is. He simply joined when it was already a working thing; anything he does is going to make it worse.

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