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[Blastr]NASA reveals: We're going to Jupiter! - Page 4

post #31 of 105
Quote:
Originally Posted by Dradien View Post

Well...not exactly the only reason. CPU's used in space need to be radiation hardened and whatnot.
Link : http://science.nasa.gov/science-news/science-at-nasa/2005/18nov_eaftc/

Interesting article, just have one question, tho. Why can't they stick the cpu in a lead box??
    
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post #32 of 105
Quote:
Originally Posted by aroc91 View Post

Quote:
Originally Posted by andrews2547 View Post

At around -150C I don't think you really would need a heatsink.

Science time! Temperature is not directly related to heat. In the near vacuum of space, what few particles there are are very cold. However, because they're so few and far between, radiation is the only viable cooling method. Compared to convection or conduction, though, radiation is very inefficient. Even on the moon, a computer would not be able to get rid of heat fast enough. So, just because something is cold doesn't mean it can conduct heat very well.

Edit: Keep in mind that a thermos works on this principle. the air between the outer part and inner part is vacuumed out, greatly reducing heat transfer from the contents to the environment and vice versa.

Temperature is absolutely directly related to heat. They're both measurements of energy of a system, and you can relate the two via the heat capacity of the system. Unless you're undergoing a phase change, if you increase the heat in a system, it will directly result in an increase of the temperature of the system. And conversely, if you remove heat from a system, it will directly result in a decrease of the temperature of the system (again, assuming you're not undergoing a phase change).

The issue comes down to how you remove heat from the system in order to reduce its temperature. If you're relying on convection, if there's nothing in an environment to practically remove heat from a system, it doesn't matter how "cold" the environment is around it. The reason we think of space as "cold" is because the average kinetic energy of the particles within a volume of space is low--that's because space is a near-vacuum, with very few particles in a given volume--there just aren't enough particles to make conventional convection a reasonable method for cooling something with heat. But that doesn't change the direct relationship between the measurement of heat a system has and its temperature.
    
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post #33 of 105
Quote:
Originally Posted by daydream99 View Post

Interesting article, just have one question, tho. Why can't they stick the cpu in a lead box??

The magnetic field and radiation is so intense from Jupiter (being that it's 1100 times the volume of Earth) that you'd probably need a lead box 200 feet thick on all sides to keep it from getting fried.

Unfortunately, I think Europa is too close for humans to go to and not be killed by the radiation/magnetic field of Jupiter in a short period of time.

That would be cool tho for someone who was terminally ill tho. You know you're going to die, but you have many months to live. Makes me wonder if Carl Sagan would have undertaken such a voyage to explore the cosmos in his final years.
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post #34 of 105
Quote:
Originally Posted by StormX2 View Post

why that particular moon?
if they time it right, and we are alligned with jupiter, and Europa is on on the side closest to earth, then the journey would only be about 600 million miles lol
How long would that even take?
the Logistics behind it are mind boggling

Jupiter has over 60 moons. Europa is a all water moon, the element responsible for sustaining life on earth, so we figure there must be life forms there. For those who don't know, our reason for going there is in search of extra terrestrial life. I have seen the prototype bot they plan on submersing under the ice to automatically collect samples of life. So this trip maybe ten times more important then our trip to our own moon, as it may answer the question "do other life forms exist".
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post #35 of 105
Quote:
Originally Posted by Warmonger View Post

as it may answer the question "do other life forms exist".

I think the question is "how long will it be before we find other life forms"

There are billions of stars in the Milky-way alone and potentially quadrillions of planets. It's only a matter of time before we find extra-terrestrial life.
    
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post #36 of 105
hrmmm... first step moon of jupiter, next step.... outside our solar system... then... kepler system
post #37 of 105
I do really want to see what they can dig out of there, if it's indeed liquid ocean under that layer of ice, or it's complete ice..

I really hope mission is a go and can be sucessful
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post #38 of 105
Quote:
Originally Posted by guyladouche View Post

Temperature is absolutely directly related to heat. They're both measurements of energy of a system, and you can relate the two via the heat capacity of the system. Unless you're undergoing a phase change, if you increase the heat in a system, it will directly result in an increase of the temperature of the system. And conversely, if you remove heat from a system, it will directly result in a decrease of the temperature of the system (again, assuming you're not undergoing a phase change).
The issue comes down to how you remove heat from the system in order to reduce its temperature. If you're relying on convection, if there's nothing in an environment to practically remove heat from a system, it doesn't matter how "cold" the environment is around it. The reason we think of space as "cold" is because the average kinetic energy of the particles within a volume of space is low--that's because space is a near-vacuum, with very few particles in a given volume--there just aren't enough particles to make conventional convection a reasonable method for cooling something with heat. But that doesn't change the direct relationship between the measurement of heat a system has and its temperature.

You can relate them, but they're not directly related. What about particle accelerators? They can reach temperatures of trillions of degrees, but since it's such a small amount of matter, the overall heat is very low. Also, keep heat capacity in mind. You can put a lot of energy into water without seeing a temperature increase. You can have immense amounts of heat energy without seeing high temperature and you can have high temperatures without having very much heat energy. It's completely dependent on how much matter is involved.
    
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post #39 of 105
Quote:
Originally Posted by andrews2547 View Post

I think the question is "how long will it be before we find other life forms"
There are billions of stars in the Milky-way alone and potentially quadrillions of planets. It's only a matter of time before we find extra-terrestrial life.

So your claiming other life forms exist? If so proof.gif
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post #40 of 105
Quote:
Originally Posted by Warmonger View Post

Quote:
Originally Posted by andrews2547 View Post

I think the question is "how long will it be before we find other life forms"
There are billions of stars in the Milky-way alone and potentially quadrillions of planets. It's only a matter of time before we find extra-terrestrial life.

So your claiming other life forms exist? If so proof.gif

Mono lake comes into mind, at least for debate! biggrin.gif

Someone tell JPL to step up, spend more money and put radiation shielding on them two rovers. What good is a week if you can spend the already inflated money now and get years out of them like we did on Mars?!
    
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