Yes, and 640K of memory should be enough for anybody.
But the 640k limit was imposed by the cpu, not the os. It was a widespread nonsense that Gates invented it.
Humans Will Never Colonize Mars
81–90 of 138 posts
Re: Humans Will Never Colonize Mars
#82Earlier quoted context omitted.
Heat transfer happens by heat conduction and heat radiation, so even in a vacuum you will radiate heat away in the form of infrared photons, at least if the vacuum is not at a higher temperature. Heat radiation is however a less efficient process then heat transfer in a sufficiently dense environment. That is also an issue for spacecrafts, they need rather large radiators to radiate away excess heat into space.
Vacuum does not have a temperature. You would probably need very little thermal insulation, if any, for a space walk around Pluto as heat from sun will be quite low as well.
Re: Humans Will Never Colonize Mars
#83Earlier quoted context omitted.
Yes, but that assumes most people try to retain that knowledge longer than it takes to pass the final.
Well the details sure, but the general concept ? I have no idea of the basic reproduction number / R0 of any common virus, but I remember the idea of it. Although now that I think of it it's probably a terrible exemple since if people remembered that concept they wouldn't question herd immunity of vaccines. I guess I'm just a bit weirded out.
> First, and most serious, I believe, is the almost exclusive teaching and learning by means of pure abject memory. This in no way teaches physics as a science. Nothing is understood; it is only remembered. This in no way satisfies the reasons I outlined for teaching science. Memorization of laws does not permit one to make applications of these laws to new situations; it does not permit one the pleasure of ultimately making scientific contributions; it cannot teach any techniques with the hands. From memorizing, knowledge is not understood, and the beauty of nature is not appreciated. It does not tell how things were found out, or reveal the value of an inventive free mind.
> For example, the telescope is an interesting device to make, understand, look through, and play with. It turned men's ideas and minds in new directions. It gave a great impetus to the modern revolution of thought. For a long while it was the sole revealer of the vastness of the heavens and man's modest place in it. But, in Latin America one learns that there are four kinds of telescopes: the Newtonian, the Cassigranian, etc., etc. In the first, the image is virtual and inverted, etc. (I put in all this "etc." because I really don't know how many kinds of telescopes there are, or what their names are, or which way the image is in each kind. But don't underestimate me; I know a very great deal about telescopes – how they work, how to make and use one, their powers and limitations, etc.) The result is that the telescope is lost. There is no more telescope, no lenses, no stars, no eyes, no light – just words memorized without requiring understanding. The examination is passed, for the question was "What are the four types of telescopes?"
> I must say immediately that I am not against memorizing. Some things, even many (though nothing special) may be learned by heart; for example, it is good, but not essential, to know by heart 7 x 8 = 56. What I oppose in any teaching philosophy is that the philosophy is used exclusively; but in this case it is especially serious because so little is left of the subject.
> ...
> When asked what Brewster's Law is, advanced students answer in a flash: "Light impinging on a material of index n is 100 percent polarized with the electric field perpendicular to the plane of incidence if the tangent of the angle of incidence equals the index of refraction."
> To these same students I then say, "Look out at the bay from which the sunlight is being reflected. If I look at that reflection through this piece of polaroid and turn it, what will happen?" All I receive are blank stares. No one knows. But I get cries of surprise and delight when they try it and see the reflections getting brighter and dimmer.
> This shows something is completely wrong. There is no knowledge whatsoever of nature. With the wrong entrance clue the memorization is useless. These students are like books, no more. I can look in the index of a book under "Brewster's Law" and find a reference equivalent to the students' reply. But in the index I cannot find "sun reflecting on bay."
> What do the students know that is not easily and directly available in a book? The things that can be looked up in a book are only a part of knowledge. Who wants such a student to work in a plant when a book requiring no food or maintenance stands day after day always ready to give just as adequate answers? Who wants to be such a student, to have worked so hard, to have missed so much of interest and pleasure, and to be outdone by an inanimate printed list of "laws"?
1: http://calteches.library.caltech.edu/46/2/LatinAmerica.htm
Re: Humans Will Never Colonize Mars
#84This is a really well-written, thorough article. Here's another way to think about it: Before we try to colonize Mars, we should try colonizing Canada. It's warmer than Mars! It has air and water, so it should be easy! And yet: https://en.wikipedia.org/wiki/Population_of_Canada#/media/Fi...
Even in a work of fiction we can't seem to make use of the entire Earth!
Re: Humans Will Never Colonize Mars
#85Earlier quoted context omitted.
I honestly think that both of those are weak reasons. The first is a problem for other generations; on our own time scale we should focus on the problems that affect us on our own time scale. The second is just not compelling; space exploration is hardly the only endeavor that produces spinoff technology, and it's far from certain that it's the best or most productive way to do so. There has only ever been one goal t…
I honestly think the first one mentioned will become a "primary" reason as soon as the first largish "came from the direction of the sun" doomsday asteroid slams into us, and makes us rethink some of our priorities. Assuming we survive the event - and assuming it isn't "The Killer Event". You know - something largish that takes out 3-4 major cities, and we didn't see until much too late (like the near-space flyby we…
Re: Humans Will Never Colonize Mars
#86Honestly, I agree with the author. We'll set up a few bases, it'll take decades, and by the time we come close to having the technology to make Mars somewhat inhabitable we'll have discovered a more hospitable planet and have the spaceship tech to get there.
Re: Humans Will Never Colonize Mars
#87Earlier quoted context omitted.
Vacuum does not have a temperature. You would probably need very little thermal insulation, if any, for a space walk around Pluto as heat from sun will be quite low as well.
If you place a thermometer in space sufficiently far away from all heat sources, it will eventually reach 2.73 K, the temperature of the cosmic microwave background. I am not sure about the correct terminology but at least in some sense this is the temperature of outer space.
Re: Humans Will Never Colonize Mars
#88> Air pressure on Mars is very low; at 600 Pascals, it’s only about 0.6 percent that of Earth. > The thin atmosphere also means that heat cannot be retained at the surface. > Once temperatures get below the -40 degrees F/C mark, people who aren’t properly dressed for the occasion can expect hypothermia to set in within about five to seven minutes. Such a thin atmosphere will not transfer heat as effectively as it doe…
Poor understanding of physics are exemplified everywhere these days. It's tiring seeing so many armchair experts trying to take over the discourse with their incessant posturing.
Please allow me to quote former vice president Dan Quayle...
https://en.wikiquote.org/wiki/Dan_Quayle
Mars is essentially in the same orbit. … Mars is somewhat the same distance from the Sun, which is very important. We have seen pictures where there are canals, we believe, and water. If there is water, that means there is oxygen. If oxygen, that means we can breathe.
Re: Humans Will Never Colonize Mars
#89Earlier quoted context omitted.
If you place a thermometer in space sufficiently far away from all heat sources, it will eventually reach 2.73 K, the temperature of the cosmic microwave background. I am not sure about the correct terminology but at least in some sense this is the temperature of outer space.
Vacuum has no temperature. What you describe is a black body spectrum 'temperature'.
Re: Humans Will Never Colonize Mars
#90> Air pressure on Mars is very low; at 600 Pascals, it’s only about 0.6 percent that of Earth. > The thin atmosphere also means that heat cannot be retained at the surface. > Once temperatures get below the -40 degrees F/C mark, people who aren’t properly dressed for the occasion can expect hypothermia to set in within about five to seven minutes. Such a thin atmosphere will not transfer heat as effectively as it doe…
help me wrap my head around that. If you’re in -40 in a low pressure atmosphere, it doesn’t cool you down faster because there’s less mass for your heat to transfer to? Does that mean things don’t cool down in a vacuum? Is there a weird curve where by at some point having less cold gas arounds you means you’ll cool down faster instead of slower?
Think about when it's cold, and when it's cold and windy.
Low pressure air is like "anti" wind, even less cold then no wind on earth.