261–270 of 395 posts
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how many space-based telescopes are there? And how many will where be, once 9/10 launches fail?
> And how many will where be, once 9/10 launches fail? This is not a real thing that will happen.
How do you know by the way that this will never happen?
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I personally believe that pervasive high speed internet even in remote locations will do more for humanity than the scientific cost of these satellites. However, this conversation has basically been skipped over. Maybe you're right and I'm wrong. The constellations are being launched, and there's zero chance of shutting them down once they're serving a commercial role. Considering the abundant red tape in the modern…
> I personally believe that pervasive high speed internet even in remote locations will do more for humanity than the scientific cost of these satellites. I've had faster Internet than the average Starlink speedtest says, in rural Romania, at the foot of a mountain, wild bears and all: https://twitter.com/q3k/status/1172621386977861632 . Internet access in rural areas is pretty much a solved problem, it just now hing…
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> I was picturing some of the places I've been in Africa that don't have mobile reception and may well never get it if it means laying fiber. When was the last time that you were in Africa? And in which country, because it's an entire continent. EDIT: So I guess HN doesn't like being called out on https://africasacountry.com/ issues? Well sorry not sorry, but as someone born in Ghana I'm more a little tired of the se…
This isn't about being able to afford infrastructure. It's about population density in rural areas. North America and Australia (where I'm from) have the exact same issue. No country is going to spend a million bucks to lay fiber to ten person towns in the middle of nowhere.
EDIT: Wow, you guys are really bad at admitting your own blatantly obvious biases, aren't you?
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The readout time for astronomy CCDs is typically between 2 and 30s (going faster produces more noise), so there is a lower limit on how short you can make exposures. In LEO the apparent movement of satellites is around 3.6 arcmin per second, which means for an average sized detector that covers maybe 20 arcmin it takes about 6s to produce a streak that covers the full length of the detector (bit longer depending on t…
I'm not sure you're thinking about it the right way. Or maybe I'm not. It seems you're assuming that every exposure you take will have a streak in the same spot from a satellite. It's more realistic that a large portion of exposures will have no streak at all, or that if you re-exposed a detector on the same piece of sky, any streak it would see the second time would be in a different place than the first. So if you…
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> I was picturing some of the places I've been in Africa that don't have mobile reception and may well never get it if it means laying fiber. When was the last time that you were in Africa? And in which country, because it's an entire continent. EDIT: So I guess HN doesn't like being called out on https://africasacountry.com/ issues? Well sorry not sorry, but as someone born in Ghana I'm more a little tired of the se…
This isn't about being able to afford infrastructure. It's about population density in rural areas. North America and Australia (where I'm from) have the exact same issue. No country is going to spend a million bucks to lay fiber to ten person towns in the middle of nowhere.
Why not? It has been done before. Every developed country went through a period of rural electrification whereby schemes were developed to encourage and/or force electric companies to run wires out into the rural farmland. Internet is the modern analogue for electrification. Those same approaches would work equally well for fiber.
https://en.wikipedia.org/wiki/Rural_electrification
The American approach: "The Rural Electrification Administration (REA) was created by executive order as an independent federal bureau in 1935, authorized by the United States Congress in the 1936 Rural Electrification Act, and later in 1939, reorganized as a division of the U.S. Dept. of Agriculture. It was charged with administering loan programs for electrification and telephone service in rural areas. Between 1935 and 1939 – or the first 4½ years after REA's establishment, the number of farms using electric services more than doubled"
How long are digital exposures? It seems like most of the interference could be removed with a bit of signal processing.
Throwing out an image or two that had a satellite or cosmic ray pass through out of a few dozen isn't so bad. But if every single one of the images has a satellite trail you may be out of luck.
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I personally believe that pervasive high speed internet even in remote locations will do more for humanity than the scientific cost of these satellites. However, this conversation has basically been skipped over. Maybe you're right and I'm wrong. The constellations are being launched, and there's zero chance of shutting them down once they're serving a commercial role. Considering the abundant red tape in the modern…
My grandmother's only option of internet in an european city is 8mb down, 2mb up.
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My grandmother's only option of internet in an european city is 8mb down, 2mb up.
If it was dirt cheap, I'd probably jump at it. My Netflix streams the usual pablum using about 5% of the 50mb/s fibre at my house. As for phone plans, electricity and other near "utilities" it doesn't do the vendor any good if consumers actually understand their own needs. And don't get me started on megapixels!
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Isn't the solution more satellites for astronomy? In fact, couldn't the constellation of commercial satellites be used to make a massive distributed hubble telescope?
Will those american billionaires pay say for more European satellites to compensate? What if this were Chinese satellites would you have the same opinion? It would be great if this billionaires would also launch scientific satellites payed from their pocket to compensate, then I would change my mind.
They don't owe you anything.