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Next Gen Starship (chrisprophet.substack.com)
submitted 3 weeks ago by marsokod@lemmy.world to c/space@lemmy.world
[-] marsokod@lemmy.world 58 points 3 weeks ago* (last edited 3 weeks 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.

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[-] marsokod@lemmy.world 46 points 2 months ago

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 24 points 1 year ago

Most likely because the news is in English. And why would Natrium be better on an international forum?

It is Sodium in most Latin languages (despite Natrium being Latin), in Hindi and in Arabic. And Chinese has a different root. Among the 10 most spoken languages (according to Wikipedia), only Russian is using Natrium.

[-] marsokod@lemmy.world 24 points 1 year ago

If you have fiber, it's unlikely you will benefit from something like Starling. Transfer data wirelessly through a constellation of satellites will have running costs much higher than just having a fibre. That is unless you have to dog a trench or run a fibre on mast for km for just one customer, which is where Starling starts making more sense.

Starling is for rural customers, mobile customers, and possibly an option to counter monopoly abuse by some Telco companies. But if you are in a city with fibre, then do use the fibre, that's your better option.

[-] marsokod@lemmy.world 98 points 1 year ago* (last edited 1 year ago)

The Oxford study is really good. But I can't say the same about this article.

A COP of ~2 is not great for a heat pump, calling this a triumph is really weird. But from a journalist saying that a COP above 1 means the heat pump "creates energy", I am not sure I should have expected more.

But what's great is that this COP of 2, while bad, is not catastrophic. That's still in territory where gas boilers are more cost efficient that a heat pump, but unless you are living in a place that is consistently under -10C for several months, then a heat pump has overall lower running costs than a gas boiler. And you are starting to hit pretty northern territories with this.

What's important is also to be able to store heat during the day so that the heat pump runs at its most efficient time. But that can unfortunately coincide with the higher consumption time, so the timing needs to be adjusted properly to avoid using it during consumption peaks.

[-] marsokod@lemmy.world 32 points 1 year ago

It depends on what you value. For performance and power density, nothing really beats lithium at the moment.

However, for grid-scale battery these parameters are not necessarily very important. What matters most is cost over the lifetime, and that's wher zinc batteries could be useful. They have the potential to be much cheaper than the cheapest lithium batteries.

[-] marsokod@lemmy.world 63 points 1 year ago

If you are in an enterprise environment, it is easier to sell Ubuntu - at least there is a company that can provide support for it behind. Companies want to make sure someone is on the hook to fix an issue that would be blocking to them, and this is much harder with something like Debian.

That's why Red Hat is used that much in companies, and what Canonical main revenues are coming from.

But as a selfhoster, I use Debian by default for my servers. Only if there is a very specific need for Ubuntu would I switch, and I am frankly tired of the Snap shenanigans on my desktop (thinking of migrating to PopOS or KDE Neon).

[-] marsokod@lemmy.world 45 points 1 year ago

How were you even able to cross the parking lot? It's not like the Toyota Camry can ever return the salute so would you basically become stuck in a salute forever?

[-] marsokod@lemmy.world 23 points 1 year ago* (last edited 1 year ago)

I'll provide an ELI5, though if you actually want to use it you'll have to go beyond ELI5.

You contact a web service via a combination of IP address and port. For the sake of simplicity, we can assume that domain name is equivalent to IP address. You can then compare domain name/port with street name/street number: you need both to actually find someone. By default, some street numbers are really standard, like 443 is for regular encrypted connection. But you can have any service on any street number, it's just less nice and less standard. This is usually done on closed networks.

Now what happens if you have a lot of services and you want all of them reachable at address 443? Well basically you are now in the same situation as a business building with a lobby. Whenever you want to contact a service, you go to 443, ask the reception what floor they are in, and they will direct you there. The reception desk is your proxy: just making sure you talk to the right people.

[-] marsokod@lemmy.world 32 points 1 year ago* (last edited 1 year ago)

Looks like they had to respond again

https://www.reddit.com/r/pics/comments/14rn8zd/the_rpics_moderators_cant_respond_to_reddit/

/u/ModCodeofConduct,

Thank you for your recent message.

We appreciate your concerns regarding /r/PICS being marked as NSFW, and we hope that you will be reassured by our response. In short, the shift in question was not a sudden change, nor is there any risk of users being confused… and most important of all, an abrupt reversion would itself constitute a violation of the site-wide rules that you cited.

On June 16th, 2023, /r/PICS (then /r/Pics) asked its subscribers to vote on the state of the subreddit, and they overwhelmingly decided to feature only “images of John Oliver looking sexy.” On June 20th, 2023, a second poll was held, and it was determined that “any and all media featuring John Oliver” would be allowed. This also precipitated a change in the subreddit’s name from “/r/Pics” to “/r/PICS,” with the latter being an acronym for “Posts Illuminating Comedian’s Sexiness.”

As we moderated /r/PICS, however, we discovered that large amounts of profanity and offensive content – both of which are listed as NSFW by Reddit’s policies – were present in non-NSFW threads. This was problematic, as users expecting work-safe experiences were very likely to encounter non-work-safe material. Rather than abruptly alter our rules without first consulting the community (which would have confused users), we asked on June 26th, 2023 for subscribers to refrain from offering any NSFW content in non-NSFW threads.

We also requested a response from Reddit on that same date.

By July 3rd, 2023, the amount of profanity and offensive content in /r/PICS had not declined, and Reddit had not responded to us. It was publicly announced that we had no choice but to mark the subreddit as being NSFW, so as to adhere to Reddit’s own mandates. It was also made clear that our longstanding rules – rules which should have seen /r/Pics (in any form) being a NSFW community from the get-go – would be unchanged; that neither gore nor pornography would be allowed, but that tasteful nudity, profanity, and “offensive” content would continue to be acceptable. To reiterate, while we do celebrate a British comedian’s undeniable allure, we do not allow anything sexually explicit to be posted.

Our surfaced resources – our sidebar, our rules, our wiki, and our announcements – make all of this exceptionally clear, but since Reddit provides no method by which users can be required to read said resources before participating, the visible marking of /r/PICS as NSFW is vital to establishing reasonable expectations. Furthermore, as Reddit assures its partners that their advertisements will not run alongside profanity or offensive content, the aforementioned marking is also in said partners’ best interests. That same assurance indicates that moderators “set their own standards for conduct and ‘appropriate’ content,” indicating that /r/PICS is solely responsible for determining what is and is not offensive (and policing accordingly). A failure on our part to appropriately list /r/PICS as NSFW would therefore run counter to what advertisers have been told.

We do understand that the shift may have caused some minor issues for Reddit, however, and as we have no desire to harm the platform, we are more than willing to discuss the situation with you. Please respond to our previous request for communication, and we will look forward to exploring productive paths forward. In the meantime, to ensure that /r/PICS is adhering to all of Reddit’s guidelines and requests, we would be happy to revert the NSFW setting, restrict posting, and remove any and all content that could be considered “offensive” by anyone. If this compromise does not meet with your approval, please offer a publicly visible comment in response to our open letter. We understand that you are likely very busy, so we will wait until Friday, July 7th before taking any additional steps.

[-] marsokod@lemmy.world 118 points 1 year ago

I don't understand your graph. It says you are measuring gigabit/sec but shouldn't the true performance rating be gigabeans/sec for a Lemmy instance?

[-] marsokod@lemmy.world 31 points 1 year ago

The world produces 15Mt of beans every year. The average shit post with beans has 700g of beans in it. This means Lemy can scale to around 22 billions shitposts/year. We have some margin.

#shitpost

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marsokod

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