Explanation:
Mars is known as the Red Planet because it appears reddish when observed from Earth. This reddish color comes from iron oxide, commonly known as rust, which is present in large amounts on the surface of the planet. The dusty soil and rocks of Mars contain iron minerals that react with oxygen, producing the characteristic red color that gives the planet its nickname. Mars is the fourth planet from the Sun and is about half the size of Earth. Despite its smaller size, Mars has many fascinating geological features including Olympus Mons, the largest volcano in the solar system, and Valles Marineris, one of the largest canyon systems known. The planet also has polar ice caps made of frozen water and carbon dioxide. Scientists are particularly interested in Mars because there is evidence that liquid water may have existed there in the past. Because water is essential for life, researchers believe Mars may once have supported microbial life. Several space missions from NASA, ESA, and ISRO have explored the planet using orbiters, landers, and rovers. Due to its scientific importance, the question about Mars being the Red Planet frequently appears in general science sections of competitive examinations.