Which planet is closest to the Sun?

Venus is the second planet from the Sun, with an average distance of approximately 108.2 million kilometers. While it is often referred to as Earth's "sister planet" due to its similar size and composition, it is not the closest planet to the Sun.

Uranium is not a planet; it is a chemical element with the symbol U and atomic number 92. It is primarily known for its use in nuclear energy and weapons, and it is located far from the Sun in the outer regions of the solar system. Hence, it does not qualify as a choice for the closest planet.

Neptune is the eighth and farthest planet from the Sun, orbiting at an average distance of about 4.5 billion kilometers. Its immense distance from the Sun makes it the least close planet, contrasting sharply with Mercury's position as the closest.