Mercury sits closest to the Sun, but Venus reaches 867°F: Here's what makes it the hottest planet timesofindia.indiatimes.com Stand on Venus and the pressure is like balancing a small car on your thumbnail — about 1,350 pounds per square inch. Go up fifty kilometres, though, and pressure and temperature enter an Earth-like range Space Daily The hottest planet in the solar system isn't the one closest to the sun — it's Venus, one planet farther out, where a thick blanket of carbon dioxide traps h