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Mercury, the smallest and closest planet to the Sun in our Solar System, undergoes the most significant temperature changes among all planets due to its minimal atmosphere, which fails to trap heat effectively. Learn in detail about the planet mercury in this article. The right answer for this question is that the smallest planet in our Solar System is Mercury. Introduction to Mercury: The Smallest Planet Mercury is one of the eight planets that orbit the Sun in our Solar System. It is the smallest and the closest planet to the Sun. This makes Mercury the first planet in the solar system, neighbour to planet ... The smallest planet in regards to both mass and volume is Mercury — at 4,879 km across and 3.3010 x 10 23 kg, this tiny world is nearly 20 times less massive than Earth, and its diameter is about 2½ times smaller. In fact, Mercury is closer in size to our Moon than to Earth. Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon.
