What are the four inner planets of our solar system?

The four inner planets of our solar system are Mercury, Venus, Earth, and Mars. These planets are classified as terrestrial planets because they have solid, rocky surfaces, which distinguishes them from the outer planets, which are gas giants.

Mercury is the closest planet to the Sun and has extreme temperature variations. Venus is often referred to as Earth's "sister planet" due to its similar size and composition, but it has a thick, toxic atmosphere and is the hottest planet. Earth is the only planet known to support life, with a diverse range of environments. Mars, known as the "Red Planet" due to its iron oxide surface, has surface features both similar to both the Moon and Earth, including valleys and polar ice caps.

In contrast, the other options include planets that are either gas giants or do not belong to the inner category, making them incorrect in the context of identifying the inner planets of our solar system.