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Reminds me of the NYC cartoon too ;)
Im pretty sure Newyork times has come up with another racist cartoon
India's first privately-developed rocket reaches orbit on debut launch
171–180 of 230 posts
Re: India's first privately-developed rocket reaches orbit on debut launch
#172Earlier quoted context omitted.
This borders on science fiction. 88,000-and 1-million satellite clusters (as claimed in your link) are hard to take seriously, especially with the possibility of Kessler Syndrome. Also: 1. How do you cool your chips? Vacuum is a thermal insulator, so radiators are required to remove heat. nVidia (or even ASICs) require much and specialised cooling. 2. How does one radiation harden a H100? 3. I'm also seeing where TCO…
Explain to the class why Kessler Syndrome isn’t possible with large LEO constellations.
It is in fact possible to have the Kessler syndrome in LEO, the debris doesn't just immediately fall out of the sky so in practice you just need to put more satellites into a specific orbit to reach the critical density where one satellite breaking leads to a runaway chain reaction.
In actual reality it's estimated that several segments of LEO have already reached criticality, especially around 600 km: https://conference.sdo.esoc.esa.int/proceedings/sdc9/paper/3...
Re: India's first privately-developed rocket reaches orbit on debut launch
#173Re: India's first privately-developed rocket reaches orbit on debut launch
#174Earlier quoted context omitted.
Explain to the class why Kessler Syndrome isn’t possible with large LEO constellations.
In case of collision in LEO, wouldn't the debris have chance to go high altitude and cause further collisions?
No. It'll stay in essentially the same orbit.
During collision, some of the energy will be lost, so the fragments will necessarily have a lower orbit.
The only thing that can accelerate fragments into a substantially higher orbit is the energy of elastic deformation of material during the explosion.
Re: India's first privately-developed rocket reaches orbit on debut launch
#175bravo!
Re: India's first privately-developed rocket reaches orbit on debut launch
#176Earlier quoted context omitted.
Also, Pixxel, Skyroot, and Agnikul are targeting orbital data center launches this year for defense applications (which is what the entire ODC story is about). The US NRO already uses India's Pixxel [0] along with Finland's ICEYE (which is now co-manufacturing synthetic aperture sats in India with Agnikul [1]) for hyperspectral scanning. Edit: can't reply > But.. why? Missile Defense and C4ISR [2]. Seconds matter, so…
This borders on science fiction. 88,000-and 1-million satellite clusters (as claimed in your link) are hard to take seriously, especially with the possibility of Kessler Syndrome. Also: 1. How do you cool your chips? Vacuum is a thermal insulator, so radiators are required to remove heat. nVidia (or even ASICs) require much and specialised cooling. 2. How does one radiation harden a H100? 3. I'm also seeing where TCO…
Yeah, there's no solution for heat dissolution at this time.
You can run a few cpus in space, you are a few seconds closer to the data to figure out something basic, but you cant do that much calculation. If you do much cpu intensive stuff, you just get hot quickly and you can't dissipate the heat. I'm sure new ways to cool down will be developed, but there's not even any experimental techniques, right?
Re: India's first privately-developed rocket reaches orbit on debut launch
#177There is just so much that can go wrong with rocket launches if you do cursory reading about these things. A few random examples: The lowest stage cant just be "turned down" or modulated because they work by burning an inner solid rubber lining that's like an annular cylinder. The first three stages are roughly doing the job sequence: `lift off the ground -> reach target altitude -> reach target orbital velocity` and…
> I do wonder if almost all of their expertise was used for the first three stages(and they are not 3d printed)?
Maybe this helps: https://www.isro.gov.in/TechnologyTransfer.html
Re: India's first privately-developed rocket reaches orbit on debut launch
#178A small but bright light in an economy where manufacturing jobs are hard to come by ( https://archive.ph/Haj8n ).
It’s a strange place. They’re building out expressways and railways at a breathtaking pace (something like an entire Switzerland’s worth of new track every year), are simultaneously building out multiple nuclear reactors, exports and manufacturing are shooting up, but the cities still look like shit.
See this comment and it's containing thread (especially the parent) to know why the cities look like that.
https://news.ycombinator.com/item?id=48904776
The last bullet point in adithyareddy's comment below here also captures a similar point.
Re: India's first privately-developed rocket reaches orbit on debut launch
#179Earlier quoted context omitted.
Right, but see the details for estimated range and the map. Not that India has any foreseeable need to nuke Argentina but it's not in range. It's entirely possible the public data is wrong and the Agni VI has a global range. But by definition if you can put something into a 350x350 km low earth orbit (something like 7800m/s total delta V) you could also deliver a re-entering payload from your launch site to any other…
I was under the impression long range missiles aren't much use in global warfare anymore, because they are easy targets for missile defence systems. Even if your target doesn't have missile defence systems, any ally of theirs along the route can intercept too.
Ballistic intercepts are still very difficult and not always certain to work. Interception is only possible within a specific trajectory window with limited number of shots.
The missile defense we commonly hear about these days is used against lower speed , shorter range and altitude missiles:
Re: India's first privately-developed rocket reaches orbit on debut launch
#180Earlier quoted context omitted.
> Is my borderline childish understanding of basic physics THAT off because I cannot see the value or utility (beyond a small smear of niche edge cases) of space-based compute? Don't worry, most of the people online didn't get the memo on this. One of the major selling points of orbital compute is power supply - more specifically, it turns out that, compared to beaming power from space, it's projected to be cheaper t…
Everybody keeps talking about cheap, clean power. But where I live the price of power has gone up dramatically in recent years. Free power (well, marginally free, anyway) is a major plus.
In France, where we have relatively cheap and clean energy, they plan to build GW DCs with GWs setups of diesel backup generators. When these will run, the pollution will be staggering.