cnlevy

8 ms·

31.
by cnlevy 3y ago
Until now, rockets have been produced "by hand", one by one. And you get handcrafted prices for rockets. To lower pricing, and revolutionize space travel, you need a production line of rockets. What will you do with 100s of rocke
32.
by cnlevy 3y ago
Rotating molecular motors exist (a proton powered turbine in the video) http://biovisions.mcb.harvard.edu/anim_mitochondria.html
33.
by cnlevy 4y ago
Yours is a perfect example of a recursive comment
34.
by cnlevy 4y ago
> which is likely way too low for humans We don't really have a way to know until we get experimental data (real humans on Mars). Until then, it's all just (un)educated guesses.
35.
by cnlevy 4y ago
> that's how things work when you're dealing with dangerous stuff What the OP described was looking more like an Italian strike than manufacturing sensitive construction https://en.wikipedia.org/wiki/Work-t
36.
by cnlevy 4y ago
Actually, there is : https://caseyhandmer.wordpress.com/2019/10/20/omg-space-is-f... It is time we move away from the LNT (Linear No Threshold) radiation risk modeling. See https://en.wikipedia.or
37.
by cnlevy 4y ago
> The Carlsbad Desalination Plant near San Diego was completed a few years ago and is now operational. It is the largest, most technologically-advanced and energy-efficient desalination plant in the United States. It is approximately the
38.
by cnlevy 4y ago
Differential pressure + milli-g induced gravity using thrusters should help a lot. I bet it won't take more than 5 tries to do a full tank Starship transfer. And SpaceX iterates quickly
39.
by cnlevy 4y ago
It's more like 4 years for ONE RS-25 ... https://www.reddit.com/r/SpaceLaunchSystem/comments/pbk4am/t...
40.
by cnlevy 4y ago
F9's fineness ratio makes it very sensitive to weather. Soyuz rockets can launch in blizzards. Starship should be weather insensitive as well. Now for the launch platform, it will have to be built about 30km from shore, and could be ac
41.
by cnlevy 4y ago
Starship's payload volume is around 1000 m ^3, which should be about the same as an A380 interior volume. For a flight time between 20 (minimum) and 40 minutes (maximum) to anywhere on earth, this volume could comfortably fit 1000 pass
42.
by cnlevy 4y ago
There is only minor uranium prospecting at the moment, since the demand is declining. Additionnally, it doesnt take into account new technology for extracting uranium (from sea water, for example) When demand will increase, propsection will
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by cnlevy 4y ago
This was an environnemental directive, for not releasing water too hot into the rivers. This measure has been temporarily suspended by the government. The major factor is for delayed maintenance during COVID, and corrosion problems appearin
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by cnlevy 4y ago
Just stack the mirrors inside Starship, and assemble them in space. Below, an example of a 300m diameter telescope using 8-meter mirror segments assembled in-orbit https://caseyhandmer.wordpress.com/2021/11/17&#x2F
45.
by cnlevy 4y ago
> My point is that whatever NASA wanted to do after Apollo was never going to happen and wasn't sustainable There was a project to make the Saturn V partially reusable, see http://www.collectspace.com/ubb/Forum2
46.
by cnlevy 4y ago
The Roman Empire would like to have a word with you https://fee.org/articles/bureaucracy-kills-a-lesson-from-rom...
47.
by cnlevy 4y ago
Source: https://news.ycombinator.com/item?id=31592976
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by cnlevy 4y ago
Cars weren't an option in 1910. So for a 50km trip, you had to take the train. Today's fast passenger train needs are for 200km+ distances
49.
by cnlevy 4y ago
Decisive action ? We are far too economically dependent on China for anything comparable to Russia. In fact the only products the West depends on Russia, gas and oil have not been sanctioned !
50.
by cnlevy 4y ago
And they'll confiscate the earth because it transgressed the law by being round.
51.
by cnlevy 4y ago
At home, I have a water pressure regulator. It came welded shut by the manufacturer because, no water flowing at all means no risk of overpressure at all. Regulation doesn't means only hindering the industry, but accompanying its deve
52.
by cnlevy 5y ago
You could punish in other ways than prison. Especially in a way to make them repair the damage they did.
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by cnlevy 5y ago
cancel culture doesn't originate in China. It's an evolution of the western idea of equality and individualism taken to an extreme
54.
by cnlevy 5y ago
Sure, African agriculture is already at max. efficency. Giant farms fully mechanized, of course /s
55.
by cnlevy 5y ago
They have enough rockets equipped with ASAT weapons to destroy the Starlink satellites ? All 40 000 of them (planned, about 2500 already in orbit)? https://www.cnbc.com/2021/03/12/spacex-prepares-for-air-forc.
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by cnlevy 5y ago
source ?
57.
by cnlevy 5y ago
Cryogenic in-orbit refueling is not breaking any physics laws and allows to reset the Tsiolkovsky rocket equation from orbit, so you can gain 2 orders of magnitude on payload weight. The hardest part would be logistics management (10 tank
58.
by cnlevy 5y ago
I'm looking for the day where 1000 Starships pull a million ton ice asteroid into Mars in order to thicken its atmosphere.
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by cnlevy 5y ago
> if they can solve launching and landing near population centers They are planning a solution for that: offshore launch platforms [0] 30 km at sea, directly accessible by high-speed train, à la https://en.wikipedia.org/w
60.
by cnlevy 5y ago
A human in ONE day can explore more than a rover in a year. There's no comparing the amount of research which can be done by a teleoperated rover to what can be done by a real human on-site. As a comparison, Opportunity rover covered 4

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