Venus tourism poster, created for by NASA/Jet Propulsion Laboratory-Caltech (Creative Strategy: Dan Goods, David Delgado; Illustrator: Jessie Kawata)
Venus is so inconsiderate. It presents itself as a sister world, one that would seem at first glance to be very Earth-like, but… on closer examination it’s utterly hostile to life as we know it. Surface conditions would be extremely challenging for terrestrial life, what with the toxic atmosphere, crushing pressures, and blast-furnace-like temperatures.
That’s at the surface, however. Just fifty kilometers above the surface, there is a region with terrestrial pressures and temperatures, a veritable garden of Eden where an unprotected human would not be almost immediately incinerated but instead would expire painfully (in just a few minutes) due to the lack of free oxygen and the prevalence of toxic gases.