Have you ever been a student or been to school? If you can read this post, then you've probably been to school and I'm pretty sure that you've learnt about Solar Systems or at least, you've been thought.
During lessons, I was thought that that Mercury was the closest planet to the sun and the Earth was the third planet away from the sun. I've always assumed that Mercury was the hottest planet since it was closest to the sun.
Wouldn't you agree with me that it makes sense? Well, I've got news for you. The closest planet to the Sun is Venus, but the hottest planet is Venus. Yeap, the second planet away from the Sun is the hottest planet in our solar system.
You've heard of global warming on planet earth as a result of carbon dioxide and that's the reason why Venus is so hot.Venus' atmosphere is mainly composed of carbon dioxide and sulphuric acid clouds which trap the heat from the sun. This causes the temperature on the planet to go as high as 462 degree Celsius.
Mercury isn't the hottest planet because it doesn't have an atmosphere so when the heat reaches Mercury, it goes back into space as an atmosphere is needed to hold and trap heat. So when ever you teach someone about the Solar System, add that Mercury is closest to the Sun, but not the hottest planet.