Which planet is closest to the sun?

Mercury is the closest planet to the sun in our solar system. Its proximity to the sun means it has a shorter orbit, taking just about 88 Earth days to complete one revolution around it. This closeness results in high temperatures on Mercury during the day, due to the intense solar radiation it receives, while it can become extremely cold at night when the sun sets. In contrast, Venus, Earth, and Mars are positioned further away from the sun. Venus, although often referred to as Earth's "sister planet" due to its similar size and structure, orbits at a greater distance. Earth's position allows it to sustain life, while Mars, the fourth planet from the sun, is even farther out and has its own unique conditions that differ significantly from those of Mercury. Understanding Mercury's position as the closest planet helps clarify the dynamics of our solar system's structure and the conditions that various planets experience.