Mars is the fourth planet in our solar system and is often called the "Red Planet."

The red color comes from iron oxide (rust) in the soil and dust on the surface.

Mars has two small moons: Phobos and Deimos, which were discovered in 1877 by Asaph Hall.

The names Phobos (fear) and Deimos (terror) come from Greek mythology and refer to the sons of the war god Ares, who corresponds to the Roman Mars.

Phobos orbits Mars three times a day and is slowly approaching the planet – in millions of years, it could crash or break apart.

Mars is about half the size of Earth, but has a similar land area, since oceans take up much space on our planet.

The gravity on Mars is only 38 percent of Earth's, so you could jump three times higher there.

Olympus Mons is the tallest volcano in the solar system, at about 22 kilometers high – almost three times as tall as Mount Everest.

Valles Marineris is the largest canyon in the solar system, over 4,000 kilometers long and up to 7 kilometers deep.

Mars has massive dust storms that can cover the entire planet for months, and polar ice caps made of frozen water and CO₂.

Planet Mars: If you're really there on site, you experience: More than one satellite, a different gravity, the Earth-Rising, the dependence on spacesuits.