You fly right through them (Van Allen belts). You take a little radiation hit (no where *near* lethal -- more like getting a few X-rays at the doctor's office), and you survive to reach the moon. It really is that simple, and don't let the hoaxers tell you otherwise.
My company builds components for the GPS satellites, which operate INSIDE the Van Allen belts 24/7. Most of the constellation of 24 + spare satellites have operated well beyond their intended life span -- in spite of being radiated 24/7. Sure, they were designed for a higher-than-normal space radiation environment but, the point is the Van Allen belts are not the oooohhhh leeeethal radiation bands the hoaxers would have you believe.
21 astronnauts flew through; twice. 21 returned to the earth. End of story.
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2007-10-19 10:59:43
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answer #1
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answered by tlbs101 7
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The answer is actually very simple.
Radiation is dangerous, of course--but the important thing is how MUCCH a person is exposed to. A spacecraft--then or now--is travelling very fast. So--they simply aren't in the Van Allen belts long enough to get a dangerous dose of radiation.
The idea that the Van Allen belts are some sort of lethal barrier is really just a myth that came about because there's a lot of misunderstanding about what radiation is andhow it affects people.
Now--that doesn't mean it isn't a problem for space travellers. When we stay close to earth (like the Space Station or the Shuttle) there's much less radiation because the Earth's magnetic field deflects most of it. That's why astronauts can stay up for months aat a time. If we start having longer stays, though, such facilities will have to be shielded.
And travel further from Earth will mostly require shielding--as will long stays on th eMoon (t does not have a magnetic field). The Apollo astronauts were able to make the trip in an unshielded ship because it was a short trip--a few days--and tey were carefull to avoid periods of solar flares, when the radiation level in space jumps.
There's two ways to protect a spacecraft for a long voyage. One is very simple: jsut surround the astronauts with enough mass--anything will work, as long as there is enough of it. That's not too practical, though--all that extra mass would make it impossible for the spacraft to carry enough suplies and fuel to make a trip to the moon, much less another planet like Mars. Our unmanned spacecraft can do this because there's no people on board.
Uning mass as shield ing will work on the Moon when we have bases there--youcan just put facilities underground or cover them with soil. But spacecraft will need to use the second method--and that's for the ship to generate its own magnetic field to deflect radiation. NASA is currently working to develop the technology to do that.
2007-10-19 12:28:26
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answer #2
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answered by Anonymous
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The Van Allen Radiation Belt is a torus of energetic charged particles (plasma) around Earth, held in place by Earth's magnetic field. The Van Allen belts are closely related to the polar aurora where particles strike the upper atmosphere and fluoresce.
The presence of a radiation belt had been proposed by Nicholas Christofilos [1] prior to the Space Age and was confirmed by the Explorer I on January 31, 1958, and Explorer III missions, under Dr. James Van Allen at the University of Iowa. The trapped radiation was first mapped out by Sputnik 3, Explorer IV, Pioneer III and Luna 1.
Energetic electrons form two distinct radiation belts, while protons form a single belt. Within these belts are particles capable of penetrating about 1 g/cm2 [2] of shielding (e.g., 1 millimetre of lead).
The term Van Allen Belts refers specifically to the radiation belts surrounding Earth; however, similar radiation belts have been discovered around other planets. The Sun does not support long-term radiation belts. The Earth's atmosphere limits the belts' particles to regions above 200-1,000 km,[3] while the belts do not extend past 7 Earth radii RE.[3] The belts are confined to an area which extends about 65°[3] from the celestial equator.
An upcoming NASA mission, Radiation Belt Storm Probes will go further and gain scientific understanding (to the point of predictability) of how populations of relativistic electrons and ions in space form or change in response to changes in solar activity and the solar wind. The Apollo missions went quickly through the belt and the crew was not exposed long,today if we go again we would do the same thing with more advanced craft...........
2007-10-19 10:06:39
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answer #3
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answered by sirmrmagic 6
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The Apollo spacecraft passed through the Van Allen belt quite quickly, so that in the short time they were exposed, the astronauts did not receive a dose of radiation considered dangerous.
Regarding the Van Allen belts, and the nature of the radiation in them, they are doughnut-shaped regions where charged particles, both protons and electrons, are trapped in the Earth's magnetic field. The number of particles encountered (flux is the technical jargon, to impress your friends!) depends on the energy of the particles; in general, the flux of high-energy particles is less, and the flux of low-energy particles is more. Very low energy particles cannot penetrate the skin of a spacecraft, nor even the skin of an astronaut. Very roughly speaking, electrons below about 1 million electron volts (MeV) are unlikely to be dangerous, and protons below 10 MeV are also not sufficiently penetrating to be a concern. The actual fluxes encountered in the Van Allen belts is a matter of great commercial importance, as communications satellites operate in the outer region, and their electronics, and hence lifetimes, are strongly affected by the radiation environment. Thus billions of dollars are at stake, never mind the Moon.
2007-10-19 10:05:33
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answer #4
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answered by m.charlee 3
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Samantha, dear, what you call "being open minded", others call "pea brained". Especially after you have proven your non-existent understanding of Earth's radiation belts and orbital mechanics.
What is much worse, though, the people who actually went to the moon and the people who made it happen will simply say that you are a brat who does not appreciate what they have done and that you are a liar.
And truth to be told, that is all you are. Maybe you don't want to be one, but if someone keeps repeating an untrue thing time after time after being told several that it isn't true, the label sticks, once and for all time.
So the only question that reasonable people have is, why do you keep lying? What good does it do, for others or even for yourself? What do you hope to achieve? Are you trying to be interesting? Get attention?
Well, this is not the kind of attention I would want for myself. But maybe you are that desperate.
Nobody can know, except for yourself.
Take care!
2007-10-19 10:59:52
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answer #5
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answered by Anonymous
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"Radiation" is not a dirty word. There is radiation in your own kitchen. Its effect on you depends, obviously, on how much there is.
Going through the Van Allen belt gave the astronauts as much exposure to radiation as they would have received in an afternoon at the beach.
2007-10-19 23:58:30
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answer #6
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answered by Anonymous
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radiation is not automatically deadly. it is estimated[1] that objects in the belts receive 2500 rems per year. assuming one hour transit time (surely it was less than this, but this will serve as an upper bound estimate), the astronauts would recieve 0.3 rems. at this level there are no symptoms expected from acute radiation poisoning[2] although there is the possibility of cancer later on.
2007-10-19 10:21:40
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answer #7
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answered by vorenhutz 7
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Well we went through at a weeker point so they go just as much as an X-ray at a doctors office. We can easly go through them now days as we could in 1969.
2007-10-19 11:59:44
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answer #8
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answered by Mr. Smith 5
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What about the mirrors that they left there. I was part of the group that tracked that . The laser had an accuracy of 10 cm.
2007-10-19 10:16:28
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answer #9
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answered by JOHNNIE B 7
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The main problems were getting through the custard nebula ( about half way ) and the lander's supports sinking into the green cheese when we got there
2007-10-19 10:11:29
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answer #10
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answered by Anonymous
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