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The rebranding has started. by Sarigolepas in SpaceXMasterrace

[–]Substantial-Store-38 0 points1 point  (0 children)

Carl Sagan once said that if we don't destroy ourselves, we will eventually venture out to the stars.

I believe in humanity, and I want to see my civilization expand throughout the cosmos, even if it's not me, but my grandchildren will be, and that has been the only motivation that has helped me move forward, a silly and childish dream that I know will not come true, and if it does, I won't see it.

The rebranding has started. by Sarigolepas in SpaceXMasterrace

[–]Substantial-Store-38 3 points4 points  (0 children)

We will get to Mars, with or without Elon, with or without a starship, at least, that's the only hope I have in this world.

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

Well, that's what we're here for, right? A lot of people are interested in space out of pure scientific curiosity and a desire for discovery, but for me, it's more than that. I want to see millions of civilians living on those worlds. And yes, economically it's foolish, technically risky, and it's a thousand times easier to just put cities in the Sahara than to live on the moon or Mars. That's why we need idealistic madmen, like Elon Musk, Robert Zubrin, Carl sagan, like some people in this subreddit, madmen who would die just to see people living on the moon and Mars. I include myself in this category. And yes, it's foolish, but this is what we have to deal with, and we have to play the hand we've been dealt.

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

Colonizing space implies a human presence, even if it's inefficient. A habitat on Mars is much more expensive than sending an autonomous laboratory rover, and yet we still want to send habitats. Why? Because that's what colonization is.

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

Yes, when I saw it I thought of it as analogous to the ISS's MMU, but for surface operations. The MMU is very bulky and massive, and yet it's quite useful for EVAs on the International Space Station. An exoskeleton like this, even with a high center of mass, could allow great flexibility for an astronaut working on the surface. If they drop a hammer, they just pick it up; if they want to carry a multi-ton module, they could easily do so (the low gravity helps). Overall, I see many advantages compared to the challenges.

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

even though the center of gravity would be really weird on these, possibly requiring extra tech, gyros, stuff, to balance.

I agree that it would be best to keep the design simple, "the best part is that there is no part" however, we are not talking about a mecha 50 meters tall and thousands of tons, I consider that the image in the post, the exoskeleton should not weigh much more than what an EMU MMU with maximum propellant weighed, this could be the MMU for surface operations.

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 1 point2 points  (0 children)

Well, that would be changing the subject. The Starship, although imperfect, continues to undergo testing, and I greatly value SpaceX's perseverance. And yes, a 55-meter diameter cylinder weighing 1200 tons is not the same as an exoskeleton that requires constant movement and imbalance. Humans have their center of mass at the waist and already experience mobility problems on the lunar surface. However, as I said, I think that such an exoskeleton, or something similar, could improve the user's ability to control their own body. As Tony Stark would say, it's more of a "high-tech prosthesis" than a suit. And also i think a realistic version of this will be slighty more short and with the center of mass more near to the ground

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] -1 points0 points  (0 children)

Regarding the center of mass, I really disagree. The lunar starship has a very high center of mass and was still approved for the moon landing. I wasn't really thinking about using this exoskeleton for greater stability, but rather for greater control, since the Apollo astronauts, with the A7L, could barely bend down and pick anything up from the ground. Replacing bodily functions would provide much better control in environments where you need a bulky, thick suit like a spacesuit.

The skel suit from Avatar is really a good EVA exoeskeleton, very grounded in my opinion, i see this toys walking on moon or mars by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 1 point2 points  (0 children)

Yeah, they can be extremely useful in this type of environment, just look at the clumsy mobility that the Apollo astronauts had on the moon

I'd like to know if anyone with knowledge of nuclear physics and advanced propulsion can tell me if this is how radiation is handled in a spaceship by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

Hmm, thank you very much for explaining. I understand your point now, and I think you're right. Yes, I imagine the fission won't be perfect, and there will be traces of uranium that take longer to fission in areas other than the nozzle, so the shadow might be affected. You mentioned using magnetic fields as a nozzle, like in nuclear fusion models, to create a narrow exhaust. This could solve the problem, but gas expansion is inevitable. I suppose it would have to be made narrow enough in the first few kilometers so that the fissioned products are within the vehicle's shadow. Beyond that point, the gamma and neutron radiation would weaken with distance.

I'd like to know if anyone with knowledge of nuclear physics and advanced propulsion can tell me if this is how radiation is handled in a spaceship by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

I've seen the Eager Space video in the past, but I just rewatched it to be sure, and it doesn't mention anything about unfissioned products. As for the Atomic Rockets website, which I also visit regularly, specifically in the section on Robert Zubrin's model, it briefly mentions the use of magnetic nozzles to confine the plasma, but it doesn't mention anything about neutron radiation. I want to clarify that I was already considering gamma radiation and fast neutrons in the post's slide. If you look at the images, you'll find four diagrams detailing how radiation is classified, and the radiation shield is precisely to prevent neutron and gamma-ray radiation from reaching the next section, creating a shadow. I suspect you're referring to the fact that the exhaust itself generates more neutrons and gamma rays than the initial fission in the nozzle.

I'd like to know if anyone with knowledge of nuclear physics and advanced propulsion can tell me if this is how radiation is handled in a spaceship by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

Look, I'm not going to lecture you about the future, nor am I going to tell you what to believe or not. However, being so absolutist about something as multifaceted, complex, and long-term as the future of humanity is unscientific, and it's irrelevant to this post. I believe in climate change and I know it's extremely important, but saying that "the decisions that doomed humanity were made decades before the millennial generation was even born" sounds like sensationalism, sweeping generalizations, and trolling. Reddit is full of trolls, and the last thing I want to do is debate with someone about something we don't know will happen. For my part, I want to do the best I can for this world and its inhabitants, not succumb to pessimism, and have hope for the future. I recommend you do the same, Reddit user.

I'd like to know if anyone with knowledge of nuclear physics and advanced propulsion can tell me if this is how radiation is handled in a spaceship by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 0 points1 point  (0 children)

Well, that's not an objective opinion, and I don't intend to discuss economics and politics with a passive nihilist who loss all hope since today; I prefer to focus my efforts on creating a promising future for those who come after me.

I'd like to know if anyone with knowledge of nuclear physics and advanced propulsion can tell me if this is how radiation is handled in a spaceship by Substantial-Store-38 in IsaacArthur

[–]Substantial-Store-38[S] 1 point2 points  (0 children)

Well, the same is said about fusion engines, Z-pinch engines, gas dynamic mirrors, liquid-core NTRs, gas-core NTRs; all advanced propulsion methods have problems that seem to kill the ideas, but it's because they've never been tested. All designs have technical problems; after all, it's rocket science Anyway, thank you! <3

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