Why Is Venus So Hot? The Greenhouse Effect on Overdrive

Imagine wearing a heavy winter coat in the middle of summer. You would feel very hot! Venus is like Earth but wearing an incredibly thick, puffy blanket made of gas.

Earth has an atmosphere that keeps us warm enough to live. Venus has the same kind of gases, but much more of them. The main ingredient is carbon dioxide. This gas acts like a trap for heat. When sunlight hits Venus, it warms up the ground. But when the ground tries to send that heat back out into space, the thick atmosphere stops it.

You might think Mercury is the hottest because it is closest to the Sun. But Mercury does not have much of an atmosphere. It lets all its heat escape easily. Venus is farther away, but its blanket is so strong that it keeps almost all the heat inside. This makes Venus the hottest planet in our solar system.

Venus also has thick clouds made of sulfuric acid. These clouds reflect some sunlight back into space, which helps keep Venus from getting even hotter. However, they also help trap the heat that does get in. It is a perfect storm for warmth.