Which planet is commonly known as the "Red Planet"?

Mars is commonly known as the "Red Planet" due to its distinctive reddish appearance, which is a result of iron oxide, or rust, on its surface. The presence of this iron oxide gives the planet a rusty, red color that can be seen from Earth with the naked eye, contributing to its distinctive name. Mars has been a subject of interest in both ancient astronomy and modern science due to its potential for past water, signs of life, and current exploration efforts by various rovers and missions. The term "Red Planet" has become so closely associated with Mars that it is often the first fact learned by those studying the solar system.