[myrmidon]

1) Reasonable cost is what taxpayers/voters are willing to give. If you want a $100bn NASA budget, you are basically asking every American for $200/y. If you made that optional, I'd argue that a lot (most) Americans would not be willing to pay.

2) I see no probable route for fusion reactors to become a competitive source of terrestrial electricity for at least the next 50 years and possibly never; without that, Helium-3 is mostly worthless (even if your fusion bet works out, you rely on an approach winning that actually needs He3 instead of breeding its own Tritium). For everything else, I don't see extraterrestrial mining being able to compete with current prices, and any significant influx would have it crash/undermine its own market (e.g. we only extract hundreds of tons of palladium globally, per year; doubling the supply would have a major effect on price).

3) I'd argue that current Moon/Mars project are mostly ineffective showmanship/PR. If you actually wanted somewhat self-sustaining settlements/industry within the century, costs would easily eclipse our current defense budget, and without demonstrating the ability to build that on earth first the whole thing would not be credible anyway.

Our current approach to manufacturing (post industrialization) is totally incompatible with self-sustaining colonies, too. There is nothing we could realistically achieve on moon or mars even in a century that is anywhere close to self-sustaining, without basically reinventing how we build things.

So from a risk mitigation point of view the whole endeavour is useless, too (this might change within a century-- synthetic biology specifically would be very promising here).

[vincenthwt]

Reasonable Cost

1. You didn’t address my main argument: reallocating 5% of the U.S. defense budget to NASA could double its budget without raising taxes. Instead, you reframed it as additional taxation. My point is about redistributing current resources, not increasing taxpayer obligations.

2. Do you believe reallocating 5% of defense spending would harm national security? Or could it be a reasonable way to reprioritize national spending towards long-term scientific advancement?

Moon Resources

1. You claim extraterrestrial mining could "crash the market," but cheaper, abundant resources typically foster innovation and develop new industries (e.g., space-based solar power or advanced batteries), which could benefit consumers. Can you provide examples where resource surpluses caused economic collapse instead of creating opportunities?

2. You argue helium-3 is "mostly worthless" because fusion is 50+ years away. However, companies like Helion Energy predict commercial fusion by the 2030s, and technologies like aneutronic fusion could make helium-3 a critical resource. What specific evidence supports your lengthy timeline?

Effectiveness and Feasibility of Moon/Mars Projects

1. You claim Moon/Mars projects would exceed the defense budget but provide no data. NASA’s Artemis program, for example, is projected to cost $93B over a decade, far below $842B in annual U.S. defense spending. What data supports your claim of higher costs?

2. Reusable rockets, such as SpaceX’s Starship, have already reduced launch costs by up to 90%, directly countering your cost concerns. Why did you not address this?

3. Advancements in in-situ resource utilization (ISRU), 3D printing, and automated production are already paving the way for sustainable off-world colonies. Why do you dismiss these technologies entirely when critiquing the concept of self-sustainability?

4. While you note "showmanship" is a factor, history shows symbolic exploration fuels technological advancement. Apollo, for example, spurred breakthroughs in computing, communications, and materials science. Moon/Mars exploration could provide similar transformative benefits.

Comparison to AI and Synthetic Biology

1. You claim synthetic biology is more promising than space exploration, but can you provide evidence to support this? Space exploration directly addresses existential risks like resource scarcity and planetary threats.

2. Do you agree that space research fuels advancements in robotics, AI, and materials science, which vastly benefit Earth and humanity’s long-term survival? Why can’t space exploration and other emerging technologies work together to create a stronger foundation for humanity’s future?

3. Delaying space exploration may result in lost opportunities for innovation that could directly impact Earthly and extraterrestrial problems.

Conclusion

You raise important points, but much of your argument lacks supporting evidence and is based on speculation. I encourage further consideration of current research and advancements like reusable rockets, ISRU, and fusion energy, which prove the feasibility and value of space exploration. I appreciate your thoughts and look forward to continuing the discussion.

[myrmidon]

# Cost

National budget items have to stand on their own merit. I agree that the US overspends on defense, but "waste" in one place is no justification for "waste" elsewhere. You could apply the exact same argument to bloat any number of budget items in the 10 billion range, e.g. US foreign aid, and for a lot of those the humanitarian utility (and possibly even purely financial ROI) is much easier to argue than for a space program, too.

# Feasibility

The problem with any kind of space industry or self sustaining settlement is that you have to get all things there, first. How we build things currently is simply not amenable for remote bootstrapping, at all, even disregarding the fact that many critical industrial inputs easily available on earth are just... not... in space. Contrast this with biological life, which is much better at this aspects by relying on small, self-replicating building blocks for everything.

Self-sufficient colonies are currently completely out of reach. The same applies to space mining, indirectly. For those to be a credible next step, we would need to have some baseline industry already established, that would e.g. be capable of growing tens of tons of food (or refine tens of tons of aluminum per year) as a fundamental input. That is an unskippable step on the path to self-sufficiency, and an incredibly early one, too. But not only do we not have that right now, there are not even fleshed out concepts (much less projects) in the pipeline for this currently.

I confidently claim competitive mining (or independent settlements) are impossible in the next decades even with the full defense budget because there are too many intermediate steps missing that all the money in the world can not conjure up (=> see paragraph above for examples).

Cheaper launch costs or 3D printers change absolutely nothing; the problem with doing anything in space is that it costs you more than its own weight in fuel (in practice: many multiples) to get anything there, and I see no realistic paths to get "overhead costs" (separate from fuel) lower than for, say, air travel.

If you had to build a self-sufficient industry on earth that would already be incredibly challenging for any non-trivial industrial output (just think: how large is the total footprint of every industry involved in building you keyboard alone, or phone? sure there is some potential for consolidation but MUCH less than you would like without changing everything fundamentally).

If you had to pay for every single ton of material/personnel to be flown like 5 times around the full equator just to get there, it would be impossible to achieve self-sufficient industry economically, even on earth, in atmosphere, with human workforce and finetuned processes and a lot of other helpful inputs we won't have in space, and this calculus is unlikely to change anytime soon.

# Effectiveness

Even at best, say you have massive space mining industry and self-sufficient cities on Mars by the end of the century (again: this is a complete pipedream): What does that actually change? What does it get us? Basically nothing. We have a ton of problems, but doubling the available iron, aluminium, or electric energy is not gonna solve any of those. If ressource allocation is fundamentally broken, multiplying the input side simply won't help at all.

As far as mitigating extinction threats goes: Thats nice to have, but almost worthless, and you won't have any real benefit until the space colonies are fully self-sufficient. With worthless I mean: given some very conservative assumption (an asteroid impact killing every single human every 50M years, $20M per statistical human life), the "extinction insurance" would be $100M per year for the US-- not enough to pay for anything in space, really.

# Sidenote

Did not want to derail this into a fusion energy discussion, but Helion marketing is most obviously going to give the earliest timeline imaginable because the want investment dollars.

Consider critically: How far away are they from a design that can be built industrially/economically? Has to be several generations/iterations of prototype plants (this is very obvious from what they have right now). If you compare their past timelines with the present, you will find that they were ridiculously overoptimistic and they are far from finished, this is gonna get progressively worse. Technical feasibility is one thing, but economics are hard if you have to compete with panels of refined sand that harvests kilowatts of direct electrical power in a few square metres and costs less than a window of the same size...

[vincenthwt]

Your latest response still does not provide any concrete data or evidence to support your claims about space exploration being a waste, self-sufficient colonies being impossible, or AI and synthetic biology being more promising alternatives.

I have already asked for specific data to back up your assumptions, but none has been provided.

Without evidence, this discussion remains purely speculative. I recommend looking into the significant advancements in reusable rockets, in-situ resource utilization, and fusion research before dismissing their potential. Unsupported claims about feasibility or value are simply unsubstantiated opinion.