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jvanderbottoday at 3:53 PM18 repliesview on HN

OK, so the "Storing data in the network ... " title made me remember something.

If you transmit a message to Mars, say a rover command sequence, and the outgoing buffer is deleted on the sending side (the original code is preserved, but the transmission-encoded sequence doesn't stick around), then that data, for 20-90 minutes, exists nowhere _except_ space. It's just random-looking electrical fluctuations that are propagating through whatever is out there until it hits a conducting piece of metal millions of miles away and energizes a cap bank enough to be measured by a digital circuit and reconstructed into data.

So, if you calculate the data rate (9600 baud, even), and set up a loopback/echo transmitter on Mars, you could store ~4 MB "in space". If you're using lasers, it's >100x as much.


Replies

DarmokJalad1701today at 6:02 PM

During NASA's Deep Space Optical Comms demo (https://www.nasa.gov/mission/deep-space-optical-communicatio...), they transmitted video at 267 Mbps from 16 million kilometers away. That's 1.78 GiB stored in space while in transit (assuming 53.3 seconds light-speed delay).

The furthest they did was 8.3 Mbps at 400 million km which is around ~1.38 GiB in transit.

poly2ittoday at 4:10 PM

Definitely one of the harder drives feasible!

Tom 7 did something reminiscent of this if you hadn't seen already: https://youtu.be/JcJSW7Rprio.

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Sharlintoday at 4:02 PM

It's just a fancy form of delay-line memory [1].

[1] https://en.wikipedia.org/wiki/Delay-line_memory

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HPsquaredtoday at 4:29 PM

You could totally do that with the mirror on the moon. (Retroreflector + optical data transmission).

The moon is approximately (it varies) 1.3 light seconds away, i.e. a 2.6 second round trip, and optical links can have very high data rates. You could fit quite a lot of data on there! (Edit: although maybe the data rate won't be so high at these distances)

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2026iknewittoday at 4:03 PM

There is an archive of a lot of television transmission in space.

archive.space

You just need to be traveling faster than the radio waves, catch up and enjoy :)

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542458today at 6:30 PM

There's a short story by Qntm called "Valuable Humans in Transit" that I like quite a bit which hinges on this subject: https://qntm.org/transi

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diydsptoday at 5:43 PM

My friend Joe Allen did this with the air in a room!

https://youtu.be/a5hOmPdxw0U

Scaevolustoday at 4:04 PM

You can use fiber optics as an optical delay line too! About 60KB/km at 100Gbps.

https://en.wikipedia.org/wiki/Delay-line_memory

npongratztoday at 6:25 PM

pingfs has similar inspiration, where storage capacity scales with latency.

https://code.kryo.se/pingfs/

Discussed in 2015:

https://news.ycombinator.com/item?id=9844725

agumonkeytoday at 5:56 PM

allegedly, this was used long ago. a teacher told us similar stories from his early career in the 80s

made my mind tickle for quite a while

CGMthrowawaytoday at 5:41 PM

Lacks the capability of random access, which limits the practicality of it. Cool idea still

mapttoday at 6:20 PM

"a man is not dead while his name is still spoken"

GNU John Dearheart

pkoiralaptoday at 4:06 PM

So if we can somehow preserve the signal and make it go round and round, can we get long term storage out of nothing?

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journaltoday at 5:45 PM

Before I consumed calories over days to figure out syntax. Now, a language model exhausts those calories away in seconds. Eventually we will advance too far into the future that the tail end of humanity will forget how to make pants.

shevy-javatoday at 5:39 PM

> If you transmit a message to Mars, say a rover command sequence

Don't you worry!

AI rover robots are soon going to dominate Mars.

charvtoday at 4:03 PM

"Commenter shows off how smart they are with cool fun fact"