GENERAL KNOWLEDGE

Detailed explanation-1: -The Earth is sometimes called “the third planet” because it is the third planet in distance away from the Sun. As you can see from the picture below, in our Solar System, Mercury is closest to the Sun, followed by Venus, then Earth and then Mars.

Detailed explanation-2: -Mars orbits our Sun, a star. Mars is the fourth planet from the Sun at an average distance of about 228 million km (142 million miles) or 1.52 AU.

Detailed explanation-3: -Mars and the outer planets all have orbital periods greater than a year and so are further away from the Sun than the Earth. Therefore as Earth has the third longest orbital period it is the third planet from the Sun.