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Musk just addressed this. Mars has an atmosphere of CO2 and Nitrogen, so we can grow plants, a day length similar to Earth's (24.5 hours), and is larger.
by cbau 10y ago
Musk just addressed this. Mars has an atmosphere of CO2 and Nitrogen, so we can grow plants, a day length similar to Earth's (24.5 hours), and is larger.
- maerF0x0 10y agooh ok, i'm 30 mins behind live.
- dogma1138 10y agoMars has no magnetic field so you get cooked with radiation. Mars' soil contains tons of perchlorate at levels which are very toxic to humans. TBH Venus seems like a better candidate for long term terraforming. You can build floating complexes in it's upper atmosphere, and it has enough oxygen and water locked in it's atmosphere and we might be able to fix the rotation and the density of the atmosphere in one go by using the atmosphere to speed up the rotation of Venus. While both of these are quite "far fetched" technically, as far as terraforming goes we aren't any closer to terraforming mars than Venus, and at least for Venus we don't need to figure out how to give it a magnetic field.
- skykooler 10y agoVenus also has no magnetic field. It has much stronger gravity as well, requiring larger rockets to take off from it, and it is quite difficult to mine resources from due to the high temperatures and pressures at the surface, meaning all materials for a colony would need to be sent from Earth.
- dogma1138 10y agoVenus has an induced magnetic field which while isn't as good as what we got on Earth, is better than what you have on Mars. https://en.wikipedia.org/wiki/Atmosphere_of_Venus#Induced_magnetosphere https://en.wikipedia.org/wiki/Atmosphere_of_Venus#Induced_ma... Additionally the current theory is that if Venus will be sped up to below 56h per rotation it would regenerate it's intrinsic magnetic field which should be near earth levels. And while Venus does have higher gravity than Mars, it's still lower than Earth's, and overall the delta V for venus insertion orbit is slightly lower than what you need for Mars.
- raverbashing 10y agoEasier to live in Mars with some radiation and lower temperatures (and pressure) as opposed to 400C and acid rains of Venus
- dogma1138 10y agoNo one is suggesting living on the surface until it's terraformed, the dense atmosphere allows for easy construction of floating platforms. As far as terraforming goes, Venus is just a better candidate for long term colonization.
- FireBeyond 10y ago"Additionally the current theory is that if Venus will be sped up to below 56h per rotation it would regenerate it's intrinsic magnetic field which should be near earth levels." That's great and all, but how exactly do we realistically speed up the rotation of a _planet_?
- dogma1138 10y agoOne of the more "probable" and more or less energy sane suggestions would be using mass drivers to eject the atmosphere at high speeds to induce spin. The mass of the venusian atmosphere is high enough for this to actually work and still leave you a lot of atmosphere to work with, it will take 20-30 years but it still doable.
- hinkley 10y agoAnd pointing those canisters at Mars or the moon. Once you've hit Venusian escape velocity you might as well move that atmosphere somewhere else that needs it. But compressing acidic gasses makes the corrosion problem worse, doesn't it? How do you deal with that?
- richmarr 10y agoNothing says "I love you" like super-compressed canisters of acid hurtling through space at interplanetary speeds :)
- chriswarbo 10y ago> and is larger I see this as a disadvantage; the major difficulty of space exploration is getting out of the Earth's gravity well. I don't think it's wise to fall back into another one.
- Zikes 10y agoOnce you've solved dealing with Earth's gravity, Mars will be a cakewalk by comparison.
- ygra 10y agoElon actually addressed this, you only need the booster from Earth. For all interesting targets the spacecraft can launch by itself and get back to Earth. The point of the booster for Earth is both to get out of Earth's gravity well and through its atmosphere (both of which are far less of a problem on Mars).
- ncallaway 10y agoWhat if that gravity well has the resources you need to get out of it? The moon also has a small gravity well, but no real resources to help you escape it. Mars has a bit of a gravity well, but has many more resources to help you escape that gravity well.
- BurningFrog 10y agoTo me, the 2 day vs 6 months commute outweigh that. Then again I haven't done the math. In the long run, there should of course be settlements on both bodies.
- lallysingh 10y agoOnce you get there, what do you do? Just go back?
- deleted 10y ago[deleted]
- BurningFrog 10y agoI assume different people do different things... Tourism would be an obvious sustainable Moon industry. That does fit your description :)
- andygates 10y agoWhat do people do on Earth? Live, thrive, expand, explore. All that stuff.
- cbhl 10y agoWhen the pilgrims originally sailed to North America from England, it took on the order of two or three months. A six month trip to Mars seems reasonable in that context.
- optforfon 10y agoIt has an "atmosphere" It's 0.00628 atm according to Wikipedia. That's effectively a vacuum. You can't have liquid water on Mars. So you can grow plants in some kind of transparent pressurized place... Just like on the Moon.. or on a space station
- ncallaway 10y agoYou can pressurize a chamber using the thin atmosphere, rather than being restricted to the gasses you bring with you. You can use ISRU and atmosphere resource extraction to generate rocket fuel on the surface of mars, rather than being restricted to the rocket fuel you bring with you. Ultimately, the answer is Mars has the necessary resources and when you look into the details just makes more sense and is easier.
- aggie 10y agoYou can produce fuel from lunar regolith as well. http://www.wickmanspacecraft.com/lsp.html http://www.wickmanspacecraft.com/lsp.html
- zardo 10y ago>That's effectively a vacuum. That depends entirely on the effect in question. You'd have a hard time pressurizing the moon's atmosphere to harvest it for propellent.
- Symmetry 10y agoBut it's still much easier to grab even a thin gas than it is to mine anything. An extremely convenient source of both carbon and nitrogen is going to be a huge benefit in terms of trying for long term sustainability. The Moon does have plenty of oxygen in various minerals and hydrogen in the polar ice but you need more than that.
- baq 10y agothis effective vacuum gives a 10m column of water equivalent of radiation protection. you'll really like it compared to the moon.
- winter_blue 10y ago> and is larger Mars is much smaller than Earth. From Wikipedia: "Mars is less dense than Earth, having about 15% of Earth's volume and 11% of Earth's mass, resulting in about 38% of Earth's surface gravity." See: https://en.wikipedia.org/wiki/Mars https://en.wikipedia.org/wiki/Mars
- skrause 10y agoIt's still much larger than the moon.
- brianlweiner 10y agoParent was making a size comparison to the moon.
- freehunter 10y agoLarger than the moon.
- lallysingh 10y agoI wonder if the 1-way ticket to mars would appeal to older folks who can survive the trip, but don't have the physical strength for much adventure on earth. Ref: Old man's war.
- jpindar 10y agoNice idea, but I assume anyone recruiting for space travel is going to insist on people who are very fit and in 100% good health, which usually means fairly young people. Certainly there could be some older people, but probably not a majority.
- azeotropic 10y agoWhich is why the ISS is populated by PhDs in their 40s? Of course you want the first colonists to not be sickly, but they won't need to be Olympic decathletes in their 20s. Equipment for lifting heavy objects can be sent more cheaply than people (it can go slowly and doesn't need life support). I think for a venture like this maturity and patience is going to be more important than physical strength. There will be a lot of tedious tasks with long checklists that need to be followed near exactly to succeed. There will be a lot of disappointment and frustration when things fail or timelines slip. There will be the irritations of being stuck in a small social circle with a few people you intensely dislike but have to depend on for survival. Add in the fact that your sperm or eggs will probably get exposed to large doses of radiation until they figure out how to get to Mars faster, and it will be far less attractive to anyone who is planning to have kids someday.
- Udo 10y agoThere are other important reasons for this that don't make such a great subject for a public presentation, such as getting away from Earth's political and military sphere of influence and achieving greater redundancy in case a large asteroid impact event happens on the Earth/Moon system.