marsokod

joined 1 year ago
8
Next Gen Starship (chrisprophet.substack.com)
[–] marsokod@lemmy.world 58 points 1 month ago* (last edited 1 month ago)

There are a few things that are different from what NASA has done in the past:

  1. SpaceX Rocket is the most powerful rocket ever, surpassing everything that NASA or anyone else has ever done.

  2. they are landing the rockets, with the aim of being able to recover them. If you skip the technicality that SpaceX first stage is suborbital but is part of an orbital launcher, that makes SpaceX the only entity who has achieved that, with some comparison to the Space Shuttle and Buran, though both were losing significant sections of the initial launcher, with very difficult repairs once on the ground.

  3. the cost of the launcher. In terms of capabilities, NASA's SLS is probably close to Starship. However, it costs around $2B/launch, and nothing is recoverable. Starship is meant for low cost. It is estimated that the current hardware + propellant for a single launch is under $100M. With reusability, a cost per launch under $10M is achievable in the mid term (10 years I would say) once the R&D has been paid ($1.4B/year at the moment, I would guess the whole development for Starship will be $10-20B, so same if not less than SLS).

  4. the aim for high speed reusability - SpaceX aim is to launch as much as possible, as fast as possible, with the same hardware. While it is a bit early to understand how successful they will be (Elon was saying a launch every 1hr, which seem to be very optimistic, I would bet 6-12hrs to be more achievable). That was NASA's original goal for the Space Shuttle, and they failed that.

  5. finally, orbital refueling means you have a single vehicle that can basically go anywhere in the inner solar system without much issues, and minimal cost.

Also, what gets people excited are the prospects of what this enables. A 10-100x decrease in the access to orbit changes completely the space economics and opens a lot of possibilities. This means going to the Moon is a lot simpler because now you don't need to reduce the mass of everything. This makes engineering way easier as you do not need to optimise everything to death, which tends to increase costs exponentially. And as for Mars, Starship is what makes having a meaningful colony there possible. Doing an Apollo like mission on Mars would have been possible for decades, but at a significant price for not much to show for. With cheap launch, you can just keep sending hardware there.

[–] marsokod@lemmy.world 5 points 2 months ago

Solution numéro 4: intégrer le prix de l'amende aux voitures polluantes ? Ça fera passer une partie des ventes vers de l'électrique et donc évitera l'amende ?

[–] marsokod@lemmy.world 45 points 3 months ago (7 children)

The more it goes, the more there will be pressure on the Russian forces to divert their resources there. It seems to be a relatively cheap way for Ukraine to alter the whole battlefield, fighting where they are stronger.

[–] marsokod@lemmy.world 22 points 4 months ago

Around 20-25% power consumption reduction against native resolution, that's neat.

[–] marsokod@lemmy.world 4 points 8 months ago

To do the math, an assuming constant volume, a 30C increase corresponds to around 10% increase in pressure. That's well within the margins of the tyre even if you go to the max rated.

If you then consider deformation and most importantly leakage over several weeks, this is a non-issue.

[–] marsokod@lemmy.world 14 points 8 months ago (1 children)

I have been using Bookstack, I like it though it is missing a few features I would love:

  • you cannot insert a video in it
  • there is no possibility to comment on a particular text
  • the permissions management is only done with roles. That's fine generally but I wanted to be able to share a specific page with a specific user, and for that I had to basically create a dedicated role for this use.
[–] marsokod@lemmy.world 21 points 9 months ago

You cannot really hide it. The launch has to be public to warn airplanes and ships so they can avoid the area. And once the launch is public, such a failure is quite evident to anyone who was interested in following it, so you might has well publish the news instead of trying to hide the unhidable.

[–] marsokod@lemmy.world 6 points 9 months ago (1 children)

I wear slippers inside mostly to protect agains cold floor, coffee tables, and most important of all, Lego bricks on the loose.

Also another reason to wear shoes inside is when you are constantly going inside and outside. Which means then your floor is dirty.... which means you want to protect your feet from the dirt. That's a vicious cycle but can be one of the reasons.

[–] marsokod@lemmy.world 7 points 10 months ago (1 children)

I, too, have children at home.

[–] marsokod@lemmy.world 3 points 11 months ago (1 children)

En même temps, maintenant tu parles de ça au lieu de parler de la loi. Il a réussi son coup.

[–] marsokod@lemmy.world 4 points 11 months ago

It means that U.S. automakers find it cheaper to have their vehicles made in China and then import them in the U.S., rather than make them directly in the U.S. in the first place.

This means that manufacturing in China is so cheap that even with the tariffs, it is more cost effective to go there. If your goal with the tariffs is to level the game, then this should not happen (no one would relocate like that unless there is a massive gain).

 

Hello everyone, I would need some advice on my setup.

I had an ISP with basic DSL 60/20Mbps and I was hosting my services at home with SWAG as a main proxy, opening the ports. I ordered 2 days ago a plan with a new ISP for a 1Gbps line, that offered port forwarding as well. The installation was done today and it turns out they retired the port forwarding on my offer yesterday.

I can see potentially 3 choices:

  1. stay with the old ISP and the slow-ish line. My main issue was the uplink speed that made off-site backup a pain
  2. go with the new ISP but order the higher speed plan that is £25/month more expensive, and without a proper guarantee that they will keep offering the port forwarding
  3. use the non-port forwarding option, but rent a small VPS that would act as a front-end (through zerotier/tailscale/direct wireguard), paying a small latency cost when accessing remotely.

I am not fully sure about the pros and cons of the different ways on the last option. I would be kin on keeping my home server fully capable, the point of me self-hosting being to cope with temporary disconnection at home. But then you can either have an IP table routing in the VPS to forward everything on the used port, or have another nginx proxy there to redirect everything. And I am not fully sure VPS providers are generally OK with this kind of use.

Has anyone got a similar setup to option 3 and would have some advices?

Edit 1:

I got a small VPS (not the cheapest one yet) and setup a wireguard tunnel following this principle and it seems to be working so far. I'll monitor a bit the situation as I have 14 days to cancel my plan. I'll also see how it works for gitea running in docker in the NAT and ssh forwarding, I suspect this will be a fun endeavour.

I decided to avoid using cloudflare tunnel. And I am avoiding using a nginx proxy at the moment as I would need to ensure the certificates are properly synced between the two (or maybe letsencrypt allows you to have two certificates for the same domain?)

 

Some exceptions seems to be accepted as long as it involves Wales and France (Wales being Pays de Galles in French).

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