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 referred to as rust, on its surface. This distinctive coloration makes Mars stand out among the planets in our solar system. The nickname "Red Planet" has become widely recognized in both scientific communities and popular culture.

The other planets listed do not share this characteristic. Venus, while being sometimes called Earth's "sister planet" due to its similar size and composition, is characterized by a thick, toxic atmosphere that causes it to appear yellowish-white. Earth, our own planet, appears blue and green from space due to its water and vegetation. Jupiter, the largest planet in the solar system, has a predominantly gaseous composition with striking bands of color but is not referred to as the Red Planet.

Thus, Mars is uniquely identified by this reddish hue, solidifying its place as the Red Planet in our solar system.