Ciértas
Ciértas is a fictional planet located in the Kepler-186 star system, approximately 500 light-years from Earth. It is the fifth planet from its star, Kepler-186f, a red dwarf. Ciértas resides within the habitable zone of its star, suggesting that conditions might be suitable for liquid water to exist on its surface. Initial telescopic observations indicate that Ciértas is a terrestrial planet, meaning it is rocky and likely has a solid surface. Its estimated size is comparable to Earth, with a radius and mass suggesting a similar gravitational pull. The planet's atmosphere is believed to be composed primarily of nitrogen and oxygen, though further detailed analysis is required to confirm its composition and density. Evidence suggests the presence of liquid water, possibly in the form of oceans and lakes, covering a significant portion of its surface. The planet exhibits a moderate axial tilt, which would likely result in seasonal variations. Its rotation period is estimated to be around 28 Earth hours. The existence of life on Ciértas remains a subject of scientific speculation and ongoing research.