THE HOTTEST PLANET IN OUR SOLAR SYSTEM IS C.Venus is the hottest planet in the solar system and has an average surface temperature of around C. Interestingly, Venus is not the closest planet to the Sun – Mercury is closer but because Mercury has Nasa Planets, Planets And Moons, Space Planets, Space And Astronomy, Solar System Poster, Nasa Solar System, Solar System Exploration, Solar System Crafts, Planeta Venus