Which planet is commonly referred to as the Red Planet?

Mars is commonly referred to as the Red Planet due to its distinctive reddish appearance, which is caused by iron oxide, or rust, on its surface. This characteristic hue makes Mars stand out among the other planets, leading to its association with the color red. Ancient cultures, including the Romans, associated the planet with war because of its color, linking it to the Roman god of war, Mars. The presence of iron oxide gives Mars its unique visual identity, making it easily recognizable in the night sky and in astronomy discussions.