As an expert in the field of astronomy, I can tell you that the hottest planet in our solar system is
Venus. However, if we're talking about the planet with the highest average surface temperature, that title goes to
Venus as well. Venus has an extremely dense atmosphere composed mainly of carbon dioxide, with clouds of sulfuric acid. This atmosphere creates a strong greenhouse effect, trapping heat and leading to surface temperatures that can reach up to **462 degrees Celsius (864 degrees Fahrenheit)**, which is even higher than Mercury's, despite being further from the Sun.
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