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### Could a fan be used to prevent overheating on a Venus bound space probe?

I saw something saying that the circuits on a Venus bound space craft would overheat and basically ruin the the spacecraft. Is that true? If so, could they install fans to keep the circuits cool?
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### Potential high temperature power sources for a Venus lander

What power sources are viable on a 'long term' Venus lander? An RTG relies on a temperature differential, and is not likely to be doable with a 457C 'cold side'. Based on this answer there is not ...
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### Why did the Herschel Space Telescope need helium coolant?

Inspired by answering this question The Wikipedia entry says this On 29 April 2013, ESA announced that Herschel's supply of liquid helium, used to cool the instruments and detectors on board, had ...
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### How does the Parker Solar Probe's heat shield protect it from dust near the sun?

In this answer the survival of the Parker Solar Probe spacecraft passing as close as 9 solar radii from the Sun's surface is discussed. Using guestimates for apoapsis and periapsis of 1.1 $a_{venus}$,...
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### Is there anything like a standard for maximum temperature for mission-critical electronics in spacecraft?

In addition to radiation, acceleration, and vibration, a launch vehicle can encounter excursions in temperature, and critical electronics for guidance and control should probably be resistant to ...
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### How can the Parker Solar Probe survive passing within 4 million miles of the sun's surface?

There is a lot of information on the internet about NASA's Parker Solar Probe mission, including several multi-hundred page scientific reviews and in-depth studies - here's one. But could someone take ...
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### When was the last normal electron tube (valve) for electrical circuitry launched into space?

The answer to my question The first transistors in space: Germanium or Silicon? What about LEO? actually addressed both the first Germanium and Silicon transistor. So now I've gotta ask about ...
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### What are the technical challenges in building a Titan rover that didn't need heating?

In the discussion of this question it is assumed that we would need to heat the rover so that (most of) it's components were operating at temperatures much hotter than ambient (about 90K). Current ...
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### Temperature of photovoltaic cells vs efficiency - is it ever actively controlled?

The efficiency of photovoltaic cells is surprisingly strong function of junction temperature. Hotter usually means lower efficiency. If one searches for example for images and sites tagged with "...