The fact that Venus is located closer to the Sun than Earth, raising temperatures on the surface to nearly 735 K (462 °C), the atmospheric pressure is 90 times that of Earth, and the extreme impact of the greenhouse effect, make water-based life as we know it unlikely on the surface of the planet. However, a few scientists have speculated that thermoacidophilic extremophile microorganisms might exist in the lower-temperature, acidic upper layers of the Venusian atmosphere.[1][2][3]