Human: What are the main differences between the planets Venus and Earth? Assistant: 
The main difference between the planets Venus and Earth is that Venus has a thick atmosphere of carbon dioxide, which traps heat and makes it extremely hot on the surface. On Earth, our atmosphere is much thinner and allows more heat to escape into space. This means that Venus' surface temperature can reach up to 870 degrees Fahrenheit (480 degrees Celsius), while Earth's average surface temperature is around 68 degrees Fahrenheit (20 degrees Celsius).