Question

If mercury is the nearest planets to sun . So how venus is the hottest planet in the solar system?

Answer 1

The carbon dioxide traps most of the heat from the Sun. The cloud layers also act as a blanket. The result is a “runaway greenhouse effect” that has caused the planet's temperature to soar to 465°C, hot enough to melt lead. This means thatVenus is even hotter than Mercury.

Answer 2

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Venus is hotter due to the greenhouse effect: Venus has an atmosphere about ninety times thicker than that of Earth, and made almost entirely of carbon dioxide, which is one of the gasses that causes the greenhouse effect on Earth.

The greenhouse effect on Venus is so great that it raises the surface temperature on Venus to, as you say, hotter than that of Mercury, despite being farther from the sun.

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