Hello, I'm an expert in astronomy and planetary science. When it comes to the hottest planet in our solar system, the title goes to Venus, not because of its proximity to the Sun, but due to its thick atmosphere and greenhouse effect.

Venus is the second planet from the Sun and is similar in size and composition to Earth. However, its thick atmosphere, which is composed mainly of carbon dioxide with clouds of sulfuric acid, traps heat and creates an extreme greenhouse effect. This effect makes the surface temperature of Venus the highest of any planet in the solar system, averaging around 900 degrees Fahrenheit (475 degrees Celsius). It's important to note that Mercury, the closest planet to the Sun, is not the hottest due to its thin atmosphere, which allows it to cool off quickly after being exposed to direct sunlight.

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Venus is the hottest planet even though Mercury is the closest planet to the Sun. The reason that Venus is hotter than Mercury is because it has an atmosphere made of carbon dioxide; it also has clouds of acid inside its atmosphere. This is called greenhouse effect.read more >>