Venus

Venus is a terrestrial planet in our Solar System, and is the closest to Earth. It has no moons. It is often called Earth's "sister planet" due to having a similar radius and mass, but it has an inhospitable atmosphere of 93 bar rendering it even hotter than Mercury. There is evidence that Venus may have had oceanic condititions and tectonic activity in the past.

Entities
Recently a study has shown irregularities of the signature chemical phosphine in the thick atmosphere, pointing towards a microscopic entity living there. Later, glycine was found further supporting the existence of an entity. However, it could be produced by an unknown reaction instead.