* Mercury: The smallest and innermost planet. It's a rocky world with a very thin atmosphere.
* Venus: The hottest planet in our solar system due to its dense atmosphere of carbon dioxide, which traps heat. It's often called Earth's "sister planet" because of their similar size and mass.
* Earth: Our home planet, known for its liquid water and diverse life.
* Mars: The "Red Planet" known for its rusty color due to iron oxide in its soil. It's a cold, dry world with a thin atmosphere.
These planets are all terrestrial planets, meaning they are primarily composed of rock and metal, unlike the gas giants that lie further out in the solar system.
