@Truthful_ast At the height of whaling voyages were commonly 3-4 years up to 7 years - humans can definitely do Mars
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nicholasjbennett
1.6K posts
nicholasjbennett
@N_J_Bennett
Long time off Earth industrialization fan, now an off Earth industrialization researcher at UNSW ACSER https://t.co/cq7LxFRtTc
Melbourne, Victoria Katılım Ocak 2019
241 Takip Edilen176 Takipçiler
“well I can’t handle the time so HUMANS WONT DO IT!!!!!!”🤓🤓🤓
Talkface@Tqlkface
@Truthful_ast Brother it is a nine month trip every two years do you believe a mars colony is REALLY feasible ???
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@Spacecolonize @PeterSweden7 Way more opportunities for more births
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Per year yes you are correct.
Per generation* no
You still need 2.1 lifetime births per woman.
Longer lifetimes will actually increase that 2.1 as more years before childbirth means more opportunities to die childless.
*generation in the sense of Total lifetime children per female.
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It's not climate change.
The falling birth rates is actually the biggest problem that humanity faces right now.
How do we solve this and encourage people to have more children?
Give me your best ideas 👇
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@Spacecolonize @PeterSweden7 Defeated ageing means; a lower birth rate is required to hit any population growth "target", & since some of the current "low birth rate" folks will opt for second or third rounds of family building their births per individual must be higher - hits the "problem" from two sides
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@N_J_Bennett @PeterSweden7 generation total fertility still matters
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@LegendaryTakes @DrPhiltill Think about what hunter gatherer human nature was like...
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@N_J_Bennett @DrPhiltill This is so silly. Human nature has been developing for 100s of 1000s of years. It’s not gonna change in 25 years just bc of some tech.
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“If everyone gets housing, food, healthcare, and toys, then nobody gets housing, food, healthcare, and toys.”
Doesn’t compute. Don’t get tripped up in the meaning of money in an abundance scenario. Inflation is not the concern.
Marcus Pittman@ImKingGinger
If everyone gets a million dollars. No one has a million dollars. I'm not sure why no one understands this.
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This collective suicide of humanity needs to turn around!
Brian Winter@BrazilBrian
Latin America is now aging faster than ANY region in the world. Chile has a lower birthrate than even Japan. What is going on?
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@LegendaryTakes @DrPhiltill People will probably stop thinking in terms of owning, they'll think "I'd be cool to live beachside, 'fund me a house and travel plans to get there'" they'll go live in the house someone bored with the beach just left, after a while somewhere else will seem more interesting...
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@LegendaryTakes @DrPhiltill Also, what people "want" will be mediated by "the Algo" to smooth the supply demand match
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@BenjaminDEKR Only a small fraction of humanity will want to be in a penthouse at the same time
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At today's global median prices, a penthouse costs about $3,000,000.
Buying a $3 million penthouse for every adult on Earth would cost about 164 times the entire world's annual economic output.
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@Robotbeat And terrible water ISRU propellant, you can only use 1/9 th mass of the water you electrolyzed, the excess O2 is too much to do anything other than use a propellant...
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Nuclear thermal rockets are SHOCKINGLY bad compared to what you’d expect based on Isp alone. Because you have to use hydrogen to get an engine that lasts and gets a decent Isp, and hydrogen is the worst propellant ever in terms of density and nearly the worst for boiling point.
sadernoheart@sadernoheart
Nuclear Propulsion Rockets could be the end game. Clearly better than Chemical Propulsion Rockets considering nuclear fission releases a million times more energy per kg than chemical bonds. Too bad they have a reactor engineering problem limiting they're mass flow rate(power density). It's been years though. Have they solved this yet and probably just haven't made it public?
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@Robotbeat Oh, and the same logic (minus aerobrake and different math) works for the lunar surface too
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This is probably actually MORE expensive than the status quo of the Starship architecture (in part because you really want to maximize payload for each one-way starship), but is an interesting thought exercise. That said, I think solar electric propulsion will enable lower costs.
Robotbeat🗽 ➐@Robotbeat
I think with about a 1MW array (and hall effect thrusters to match), you could land about 100 tons payload on Mars with a single one-way Starship launch to LEO. If the arrays are retractable, you also get a (slightly used) 1MW solar array.
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@Robotbeat IDK how it stacks against adding solar electric into the mix, but a factor of at least 10 reduction in Starships and launch pads is worth looking at.
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@Robotbeat This lets cargos be raised to/lowered from departure/arrival orbits throughout the synodic. This means fewer Starships (high cadence reuse at each end, few in interplanetary transfers) and lower required launch/land capacity in the ground segments.
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@StephenFleming @JeffGreason It's slow because they are squeezing out more payload with gravity assists, bigger chemical rockets (& propellant transfer) solves the time and payload problem at least out to Jupiter
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Chemical rockets are just too slow. Eight years in transit just to start collecting data?
We need to adopt nuclear rockets and electromagnetic propulsion systems that harvest the energy of the solar wind, so that scientific missions to the outer planets can take place within a student’s PhD cycle, not spanning entire decades of their career.
European Space Agency@esa
Three years since Juice launched on its journey to Jupiter. Arriving in 2031, it will explore the giant planet and its icy ocean moons, seeking to study them as both planetary objects and possible habitats. Next up, teams are preparing for the mission's upcoming Earth gravity assist manoeuvre later this year in September. More info 👇esa.int/Science_Explor…
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Side note: if you keep the proportions, the maximum torque a docking adapter can handle grows with the cube of diameter. Axial load by the square.
But there's no rule that says you have to limit mechanical linkages between docked spacecraft to the collar of your pressurized passage...
Kinda like how there are more secure ways to hold a phone than dangling it from its charging cable...
Ozan Bellik@BellikOzan
Love it! Next up: Very Large Docking Adapter Extremely Large Docking Adapter Overwhelmingly Large Docking Adapter
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@Robotbeat A Soyuz, a couple Cygnus rings for pressurized "supplies"/comms/thermal, and 2x Proton+BrizM could do a 500 day Mars Venus free return flyby for a solo voyager
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@Alexphysics13 Solo 500 day Mars Venus flyby using Proton+BrizM+Custom Pressurised Logistics Module (consumables, comms, thermal, power), Proton+BrizM docks to a tweaked Soyuz spacecraft, the Brizs boost to HEEO, Soyuz docks to logistics and it's Briz does the transfer burn at Pe, traj tweaks
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A fun mental exercise is to try and come up with Moon and Mars exploration programs based on the rocket technology of the 80s, 90s, 00s, and 10s either with what was already available, with available hardware+some development, or a full-on clean sheet development program.
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