1. Mars

2.  Mars Mars  Physical characteristics Physical characteristics  Moons Moons  Hydrology Hydrology  Questions Questions

3. Mars  Mars is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred - to as the "Red Planet" because of its reddish appearance, due to iron oxide prevalent on its surface.  Mars is a terrestrial planet with a thin atmosphere. Mars ha s surface with the impact craters and the volcanoes, valleys, deserts and polar ice caps. It is the site of Olympus Mons, the highest known mountain in the Solar System, and of Valles Marineris, the largest canyon. I n 2 008 was discovered enormous impact crater in Mars' northern hemisphere, 10 600 km long by 8 500 km wide.

4. Physical characteristics  Mars has approximately half the radius of Earth. Its surface area is only slightly less than the total area of Earth's dry land. While Mars is larger and more massive than Mercury, Mercury has a higher density. This results in a slightly stronger gravitational force at Mercury's surface. Mars is also roughly intermediate in size, mass, and surface gravity between Earth and Earth's Moon (the Earth is about ten times more massive than Mars, and the Moon ten times less massive). The red-orange appearance of the Martian surface is caused by iron oxide, more commonly known as hematite, or rust.

5. Moons  Mars has two tiny natural moons, Phobos and Deimos, which orbit very close to the planet and are thought to be captured asteroids. Both satellites were discovered in 1877 by Asaph Hall, and are named after the characters Phobos and Deimos who, in Greek mythology, accompanied their father Ares, god of war, into battle. Ares was known as Mars to the Romans.

6. Hydrology  Liquid water cannot exist on the surface of Mars with its present low atmospheric pressure, except at the lowest elevations for short periods but water ice is in no short supply, with two polar ice caps made largely of ice. Additionally, an ice permafrost mantle stretches down from the pole to latitudes of about 60°.

7. Questions  1. What are the name of the moons of Mars?  2. Why is Mars reffered - to as the „Red planet“ ?  3. Is there any water?

8. Thank you for attention Štefan Páll, Vladimír Kundrát