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As we all know temperature of space is near to absolute zero.Then why super conductors aren't used there?

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Superconducting magnets are used for some astro-particle physics missions, but "As we all know temperature of space is near to absolute zero" is far too simplistic. The presence of the sun means that space vehicles are not, in general, near absolute zero at all. The magnets I mentioned have to carry cryoliquids to stay cold, and when they run out the magnets have to run at lower current in resistive mode. – dmckee Feb 17 '14 at 5:08
This question appears to be off-topic (see dmckee's comment). – centralcharge Feb 17 '14 at 5:16
I don't think the question is off topic. It's a fair question, and the temperature of space (out of sunlight) is indeed near to absolute zero. The problem is staying out of the sunlight. – John Rennie Feb 17 '14 at 7:14
up vote 4 down vote accepted

The intensity of the light from the Sun at the orbit of the Earth is around 1.4 kilowatts per square metre. For comparison, a domestic heater is usually around 3 kW, so a satellite with a 2m surface area (admittedly this is bigger than most satellites) facing the Sun needs to dissipate as much energy as used to heat your living room. This is in addition to the waste heat produced by the electronics on the satellite. For most satellites it's keeping cool that's the problem, and that's why they're wrapped in reflective foil.

Where you have a satellite that needs to stay really cool, such as the Herschel Space Observatory, the satellite has to carry a supply of liquid helium to cool itself. In fact the Herschel Space Observatory ran out of liquid helium at the end of April last year and can no longer operate.

It's certainly true that if you can stay out of sunlight space is a pretty cold place. If you could avoid all reflected light then in principle you could cool to the 2.7K temperature of the microwave background, and this is cold enough to use superconductors. However this isn't a practical way to operate most satellites.

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So does this mean we can use superconductors for those satellites that are flying away from our solar system? – Louis Yang Dec 9 '14 at 2:46
@LouisYang: even on Pluto it's too hot to use superconductors. Possibly deep in interstellar space it might be cold enough, but that isn't much use if you want your spacecraft to start near a star and end near a star. – John Rennie Dec 9 '14 at 6:37

The reason superconductors are not used in space is called quantum locking. You would change your orientation to the magnetic field and move into an orbit for the locking. Changing your position is a no-no in space unless you plan for it first and as we know planning for the unpredicted isn't always possible until it is studied. They have no worked out the bugs yet.

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as for cooling they keep the inside of the space station cool I am sure cooling a space for a super conductor would be no harder maintain of the area would be difficult if the container if moving though would be the problem – TheDavid Adams Jan 25 '15 at 18:29

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