The mass of Mars is 641,693,000,000,000 billion kilograms, which is slightly over 10 percent of the mass of Earth. Mars is the fourth planet from the sun, and it is commonly known as the Red Planet since it appears to be red.
Mars has approximately 15 percent of the volume of Earth, but the two planets actually have a similar landmass. This is because two-thirds of Earth is covered in water.
Mars houses Olympus Mons, the largest volcano in the solar system, which is 21 kilometers tall. The planet also has the largest dust storms in the solar systems, which can last for months.