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Do people really think we'll colonize mars soon?
Colonizing the bottom of the ocean would be orders of magnitude cheaper, and more practical. Same with Antarctica. And there's a reason we don't do that.
I hate to sound anal, but I don't think the public appreciates how monumentally difficult space travel is, and how it gets exponentially worse with every ounce you have to carry. Even with theoretical, morally questionable tech like fission fragment drives or whatever.
Pressure is way harder to deal with than a vacuum, not that i think mars is happening any time soon
Both have unique challenges, but overall brucethemoose is right about the overall cost comparison. For instance, we could easily have a "space elevator" equivalent to the bottom of the ocean, it'd be a fraction of the cost of maintaining a freight network to mars. Pressure is hard to deal with, but not as difficult as it is to get shit out of a gravity well as dense as Earth.
The main point is the usable resources. You'd have a damn near infinite source of usable resources at the bottom of the ocean meanwhile on Mars everything would need to be scavenged or shipped.
I'm not aware of any reason on why we'd want to colonize the bottom of the ocean, but there's many reasons to want to become a multi-planetary species. Space exploration has also lead to many technologies being used in everyday life today.
What's morally questionable about fission fragment drives?
This multi-planetary species thing just won’t work. The most likely scenario is that we fail. However, if we succeed the species will split very quickly on account of Mars’ unique evolutionary environment. You would get earth humans and Mars humans, and knowing our nature as a peaceful species, I am pretty sure we’d wipe each other out in no time.
That wouldn't happen for an extremely long time. It will be many generations before Mars would be self sufficient enough that they could wage war on Earth. I don't feel like that's enough of a possibility to not even try colonizing another planet.
there’s many reasons to want to become a multi-planetary species
Yes but it's a fantasy. The scenario where mars would be truly independant of earth is basically impossible without the far more likely reality:
If we survive that long, we won't be squishy humans anymore. Uploaded, AI, genetically engineered biotech, take your pick, but shuttling regular humans around this century just doesn't make sense.
Going to the moon was a fantasy at one point. I just don't see any downsides to trying to become multi-planetary. Even if it fails there would still be technology developed in pursuit of that goal that helps life on earth.
There is a big difference between a scientific mission and a self sustaining presence.
The later is still so far off that, as was said, other technological "paths" are decades, if not centuries, closer. If we survive on Earth that long.
What I am getting at is that viewing Mars colonization as a means to preserve human life is absolutely nuts. It's literally impossible in a reasonable timeframe, even with speculative technology/engineering, without changing humanity to the point that the whole fantasy changes anyway.
Oh and on FF drives, fhey're kind of messy and risk pollution if they fail near earth (though not nearly as much as other nuclear designs). It's fine for scientific missions, but becomes much more eyebrow raising en masse for a Mars colonization type effort.
IIRC the fissile material needs to be relatively high grade.
I don't know if I quite agree with that being a morale issue. But that same logic nuclear reactors are immoral because if they blow up they can cause a lot of harm.
I do agree that it is a little sketchy for human flight, but they wouldn't use it if there was a significant chance of it harming the people on board.
, but they wouldn’t use it if there was a significant chance of it harming the people on board.
This is spaceflight. There is always a tremendous chance of harm to people on board, even with speculative nuclear technology to get the spacecraft a little less like thin paper bags.
I would highly recommend reading up on Project Rho, on somewhat feasable near term technologies if we can just figure out the engineering: https://projectrho.com/public_html/rocket/
They're awesome, and I hope they get funded. But it will also dispell any illusuion you have of spaceflight being remotely practical on a large scale.
Colonizing the bottom of the ocean would be harder than colonizing Mars. Not that either is a great idea, but just saying.
new zealand did it
Spaceships in many ways are safer than sitting at the bottom of a ditch with 7 miles of water sitting on top of you at 30,000 atmospheres of pressure.
It's also darker at the bottom of the ocean than in space.
Again... it's hard to appreciate how insanely difficult space travel is.
Just as an example, the lower stages of rockets are kind of like coke cans in terms of how much fuel they carry vs the actual machine itself. The engineering is insane. Just dropping a big chassis into the ocean in so much cheaper its hilarious.
Yes, space travel is insanely difficult.
But there is a reason why we still have not discovered the majority of the ocean. Because it is even more difficult.
I always was optimistic when I was young but the older I get the more I realise why we will not have fucking flying cars, Mars colonisation