Which planet is often referred to as the "Red Planet"?

Mars is often referred to as the "Red Planet" due to its distinctive reddish appearance, which is visible even from Earth. This color is primarily caused by iron oxide, commonly known as rust, that is prevalent on its surface. The iron minerals in the Martian soil reflect sunlight in such a way that it gives the planet its characteristic color.

The nickname is well-established in both scientific literature and popular culture, making Mars easily recognizable among the planets in our solar system. Its unique color not only differentiates it from other planets but also plays a significant role in its exploration and the public's interest in Mars as a potential location for future human colonization or scientific investigation.