Which planet is known as the Red Planet?

Mars is known as the Red Planet due to its reddish appearance, which is a result of iron oxide, commonly known as rust, present on its surface. This distinctive color has made Mars easily identifiable in the night sky and has garnered considerable interest from astronomers and space enthusiasts alike. The name "Red Planet" reflects this unique characteristic and is a significant aspect of Mars's identity, often associated with various cultural and mythological narratives throughout human history.

In contrast, other planets listed in the choices do not share this reddish hue. Venus is often referred to as the "Earth's twin" due to its similar size and mass, while Jupiter is known for its massive size and Great Red Spot—a storm, not its overall color. Saturn, recognized for its prominent ring system, is typically associated with a yellowish hue. Thus, Mars stands out distinctly as the Red Planet among these alternatives.