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Another fundamental challenge is how to receive telemetry and data from the probe once it gets there. The DSN can communicate receive from Voyager 2 - in fact i
by mmaunder 5y ago
Another fundamental challenge is how to receive telemetry and data from the probe once it gets there. The DSN can communicate receive from Voyager 2 - in fact it is right now. https://eyes.nasa.gov/dsn/dsn.html https://eyes.nasa.gov/dsn/dsn.html
But our closest star is much further away and it’s an interesting challenge to send a powerful enough transmitter that far - power being the main problem- and have an antenna on Earth or locally in space that can receive the data.
There’s also a question of bandwidth. Voyagers downlink is 160 bits per second. Webb is about 25Mbps. What bandwidth is achievable at that range?
It’s doubtful the probe would be able to receive because you wouldn’t want to send a massive antenna that far out.
There’s propagation delay which would be 4.2 years in one direction in the case of our closest star Proxima Centauri.
If we take a long view - as in, the original team would be long dead when the mission completes - I suspect this is achievable.
Check out the Lucy mission which is impressive in its orbital complexity and long time horizon if you’re into this stuff.
https://en.wikipedia.org/wiki/Lucy_(spacecraft) https://en.wikipedia.org/wiki/Lucy_(spacecraft)
- mrfusion 5y agoSo these are tiny and cheap so you stagger the launches so they can relay their data back to earth. Each one could be within a few 1000km of the next one.
- danparsonson 5y agoThat would require on the order of 10^10 probes...
- mrfusion 5y agoThanks for checking my math. Looks like we’d need to stagger them by about 100 million km to be somewhat reasonable. It’s still 400,000 times less distance to transmit a signal so it would help.
- ALittleLight 5y agoBut it increases points of failure. What if one or probes in the chain break for some reason? I guess you build in redundancy, but it's not obvious to me that the added complexity - probes have to send and receive instead of just send - is worth the benefit. I really have no idea about this space though.
- simonebrunozzi 5y ago> power being the main problem nuclear power perhaps? Not now, but maybe in 15-20 years?
- mmaunder 5y agoExactly. And it’s what we used to use.