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About Steel

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    Rocketry Enthusiast
  1. Not quite. The problem here is that neither party can actually control what state they measure. Let's say we have two entangled particles with Z spin equal to 0 - so if one has up spin the other has down spin. Alice has particle A and Bob has particle B. However, because these are quantum particles, each one has a non-zero probability when measured to have either up spin or down spin. So Alice measures the spin and gets up, so she knows that Bob will measure spin down if he measures it now. However when Bob goes to measure, there's no way for him to know whether he is measuring the opposite spin to the one Alice has already measured, or whether he has measured too early and now Alice is just measuring the opposite of what he has measured. The only way to know for sure is to have another communication channel between the two.
  2. Let's break this down a bit. First, quantum particles do not have multiple positions. When measured they have one position (with some uncertainty). As @p1t1o mentioned above, you might be thinking about entangled particles, where two particles are "linked". The properties of entangled particles do correlate superluminally (i.e when one changes, the other appears to change instantaneously). However, as also mentioned above, you cannot transfer information this way.
  3. Because the US government says rockets are a defense/military technology, therefore they don't allow foreign people to work on them. Unfortunately that's just the way it is. EDIT: I know it's slightly more complicated than that, but it is frustrating for us non-US nationals
  4. In answer to your question in the title: is it hard to become an astronaut? Yes. It's probably the single hardest job to get into, simply because there are so few astronauts. You also have to be in very good condition both physically and mentally. Usually you need to bring some other skills with you too - most astronauts are engineers, scientists, doctors e.t.c as well as being astronauts. Also, not being from either the USA, China or Russia there is less chance of being selected for flights. Most astronauts are from these three nations because they are the only ones with active crewed space programs. I'm from the UK, and despite having been involved in spaceflight since the 1960's, we have no crewed space programs, so there have only ever been 11 British astronauts. But at the end of the day, this doesn't mean it can't be done. If you are truly passionate about things in life, why not chase after them? Find out what requirements there are, and work towards achieving them. Even if you don't end up becoming an astronaut, you'll still learn and experience a whole lot of new stuff that you never would have done otherwise. In terms of jobs in the wider space industry, it's a lot easier. The aerospace industry employs over 500,000 people across Europe in a variety of jobs from engineering to accounting.
  5. I have a feeling that whoever did those calcs has a very poor grasp of the physics, seeing as they keep confusing acceleration and velocity. Anyway, they've missed the fact that the equation they've used gives the velocity squared, not the velocity. So the the actual velocity is root(6159) which is about 78 m/s
  6. Low-Thrust Orbit transfer

    Unfortunately, once you get beyond simple Hohmann transfers - which can be solved pretty simply and analytically - usually the only way to accurately come up with an answer is to solve the equations numerically.
  7. Is there a link to the contest?
  8. Which way are they all pointed? If they all point along the tangent of the ring the ring would spin (no net thrust, only a net rotation) and the ring would then break apart from the strain, unless it is a magical unbreakable ring
  9. Being stood on top of a space tower at geostationary height would feel exactly the same as being on your own in geostationary orbit at the same place
  10. From a practical point of view, maybe. From the point of view of not needlessly killing anything that strays into the path of the beam, definitely not.
  11. Excitonium!

    Correct me if I'm wrong, condensed matter was always my least favourite area of Physics, but this is exciton condensation, correct? So, much like all other condensates of quasi-particles, you get some interesting material properties to study and not much else?
  12. Excitonium!

    Anyone got any citations for some actual scientific literature on the matter?
  13. Perhaps because it's simpler, cheaper and (potentially) more reliable than fitting more rocket motors.
  14. Silicon, I've never heard it being referred to as Silicium. What language is that used in?
  15. I never had a graphing calculator at university. It would certainly make some parts slightly quicker, but unless your college requires it, you can do everything you need on a scientific calculator.