What were the two primary environmental factors that limited the lifespan of landers on the Venusian surface?

Answer

Extreme heat and pressure

The lifespan of a lander is measured in minutes due to Venus maintaining surface temperatures between about 820 and 900 degrees Fahrenheit and an atmospheric pressure over 90 times that of Earth's sea level.

What were the two primary environmental factors that limited the lifespan of landers on the Venusian surface?
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