Which planet is known as the smallest planet in the solar system?

Mercury is known as the smallest planet in the solar system. This classification is based on its physical characteristics and size. Mercury has a diameter of about 3,032 miles (4,880 kilometers), making it smaller than all the other planets. It is significantly less massive than the others, including Venus, Earth, and Mars, which are all larger in comparison.

Understanding the scale of the planets is important in astronomy. Mercury's small size is one reason it has a very thin atmosphere, which contributes to its extreme temperature variations. Additionally, its close proximity to the Sun affects its surface conditions, making it unique. This knowledge is foundational when discussing planetary science in an educational setting.