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

The planet commonly referred to as the "Red Planet" is Mars. This nickname arises from its reddish appearance, which is due to iron oxide, or rust, on its surface. The distinctive color of Mars is one of its most notable features, making it easily recognizable in the night sky.

Mars is also the fourth planet from the Sun and has been the subject of numerous studies and exploration efforts due to its potential for past water presence and the possibility of supporting life. The other celestial bodies listed—Jupiter, Mercury, and Venus—do not have the same reddish hue; instead, they exhibit different colors and characteristics due to their respective atmospheres and surface compositions. Jupiter, for example, is known for its massive size and striking bands of color, while Mercury is recognized for its gray and cratered appearance, and Venus is often associated with its bright, cloud-covered atmosphere.