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Venus has an extremely dense atmosphere made up mostly of carbon dioxide, a greenhouse gas. So while Venus is Earth's twin in many other regards, its atmosphere is nearly 100 times more massive than our own. Venus's thick blanketing atmosphere prevents heat from escaping the planet and raises the average surface temperature to 464 degrees Celsius (867 Fahrenheit), well above the melting point of lead (327.5 degrees Celsius or 621.5 Fahrenheit). To learn more about extreme conditions on Venus click here.