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35

The Venus flyby does indeed make the mission shorter, but it has some pretty serious negative consequences as well. The mission spends much more time in deep space. Approaching the sun will increase the amount of radiation exposure by a large amount. The thermal design would need to be rethought to survive that close to the Sun. The time on Mars for a Venus ...


15

Due to thermodynamics, the temperature must increase. Heat flows from hot to cold, and can not go the other direction. If there is a cold pocket between the (hot) core and the (hot) atmosphere of Venus, heat will flow into it. For it to remain cold, this heat would have to be dumped elsewhere, but since there's no colder place nearby for it to leak heat, it ...


6

The geothermal gradient on Venus may be no higher than 14K/km, that it get's warmer (not cooler) with increasing crustal depth. Locally crustal units are not closed systems but in exchange with adjacent parts, heat from below and atmosphere from above, so the gradient may be 0 or even negative, for instance when fluids take heat away or in subduction zones (...


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