Venus is the 2nd closest planet to the sun, usually the brightest, and also the hottest by far. Venus’ heat is due to a runaway greenhouse effect where its 96% CO2 atmosphere prevents heat from escaping to space, resulting in surface temperatures hotter than 840 degrees Fahrenheit. Along with that, the pressure is about 92 times the pressure at sea level, which is on par with being a bit more than half a mile underwater. This environment is one of the most hostile environments in the entire solar system and has resulted in every lander ever sent being destroyed by the heat and pressure. The longest any lander has survived on the surface was the Soviet Venera 13, but even that one lasted just 127 minutes before being crushed and burnt out.
Ironically, this hellscape is currently being studied as a possible haven for life, specifically in the upper atmosphere where conditions are more like those on Earth. Recent detections of phosphine, a bioindicator, sparked theories of life on Venus because no confirmed abiotic (caused by something other than life) mechanism for phosphine synthesis was known. However, that detection is currently disputed as volcanism has been identified as a potential abiotic source.
JML Astrophotos 