What is the cause of tremendous heat on Venus?
The thick atmosphere and clouds, which trap the sun's heat
Venus has a very strong greenhouse effect. A greenhouse effect is when the gases in the atmosphere trap more of the Sun's heat. A lot of carbon dioxide, a very dense atmosphere, and a thick blanket of clouds help trap the sun's heat. The transfer of heat by atmospheric currents means both the night and day sides are almost the same temperature. Venus is like this because it is closer to the Sun than Earth…
Quite dangerous to the equipment. The old Soviet Union tried to land probe on Venus about seven times. Only two sent back any data and the data stream was not long. The tremendous pressure of the atmosphere on Venus, the sulfuric acid atmospheric level level and the heat were all accounted for, or so the Soviets thought, and still the probes were basically destroyed.