Careers: Physics/Magnetism

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Question
Why do astronauts keep to altitudes beneath the Van Allen radiation belts when doing space walks?

Answer
Hello Sindi,
this is undoubtedly to be protected from the charged particles that form the solar wind. The van Allen radiation belts are formed by these particles, as they are trapped by the Earth's magnetic field. Space-walking below their altitude significantly reduces the radiation dose received by the astronauts.
See Wikipedia page http://en.wikipedia.org/wiki/Van_Allen_radiation_belt#Impact_on_space_travel for more reading on this subject.
Cheers,
Daniel

Careers: Physics

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Daniel Mazur

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Questions anyone (teenager, undergrad, graduate, professional) may ask on physics, mathematics or inorganic chemistry. Questions may concern subjects themselves or a possible future career in them, if you need advice on a school or hobby project, or you just came across a question that is beyond your current curriculum. I answer bare textbook problems sometimes, but I reserve the the right to redirect you to Physics-Physics section. The kind of questions I like to answer: I just started having science classes at school and they seem difficult, but I enjoy them. Where do I find more information on this, which is not in textbooks but still comprehensible to me? Just leaving high school, and I feel science is really the thing for me. Can you recommend a school and an undergrad program suitable to my inclinations? I am in my second undergraduate year in Physics. We learned the basics of universe expanding this year, the Hubble constant and all that, but invited speakers that gave talks on astrophysics in our department seemed not to agree with this model at all. Is it of any use at all? I am building a [materials research] experimental device for my masters/doctorate thesis and I have the following problem:... I have tried ..., but it still doesn't work. Where might the problem be?

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