Mars 2
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- Mars Geolagy
- We know a lot about Mars from data collected by telescopes and spacecraft as well as by examining meteorites that have come from Mars. Most of the meteorites from Mars are igneous rocks known as basalt. The oldest Mars meteorite is ALH84001, which is 4.1 billion years old. It is a rock type known as an orthopyroxenite. It also has minerals that formed by reactions between the original material and water that formed 3.9 billion years ago. The oldest known minerals from Mars are 4.4 billion-year-old zircons from a 2.1 billion-year-old meteorite (NWA 7034) found in Northwest and its pairings, which are analogous to the ancient Jack Hills zircons on Earth. The youngest known rocks from Mars are basaltic meteorites, rocks known as shergottites, the youngest of which are about 180 million years old.
- Like all the planets in our solar system, Earth and Mars orbit the sun. But Earth is closer to the sun, and therefore races along its orbit more quickly. Earth makes two trips around the sun in about the same amount of time that Mars takes to make one trip. So sometimes the two planets are on opposite sides of the sun, very far apart, and other times, Earth catches up with its neighbor and passes relatively close to itt
- How to spot Mars
- Mars has two small moons: Phobos and Deimos. Phobos (fear) and Deimos (panic) were named after the horses that pulled the chariot of the Greek war god Ares, the counterpart to the Roman war god Mars. Both Phobos and Deimos were discovered in 1877 by American astronomer Asaph Hall. The moons appear to have surface materials similar to many asteroids in the outer asteroid belt, which leads most scientists to believe that Phobos and Deimos are captured asteroids.
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