Mars - mars is the fourth planet in our solar system mara is also known as 'Red planet' because the surface of Mars is red surface are of Mars is 144.8 million km² And it's gravity is 3.721 m/s². Mars have two moon Phobos and deimos.. The two moons of Mars 1. Phobos phobos is present in the orbit of mars It's gravity is 0.0057 m/s². 2. Deimos Deimos is also present in the orbit of mars the gravity of deimos is 0.003 m/s². Human civilization in mars Still humans civilization is not on mars but after some years maybe we can go on mars. After Earth, Mars is the only place where life is possible , But not now, because humans needs water, air and food to survive. Water is in mars but it is in ice form .... But Elon Musk say in 2025 human can go on Mars