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    This article is about debris from space that survives impact with the ground. For other uses of "Meteorite", see Mular applications. For Falling star, see Meteorite (disambiguation). The 60- tonne, 2.7 m-long (8.9 ft) long Hoba meteorite in Namibia is the largest known intact meteorite. A meteorite is a solid piece of debris from an object ...

    • Appearance
    • Moons
    • Physical Geography
    • Observation of Mars
    • Life on Mars
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    Mars is a terrestrial planet and made of rock. The ground there is red because of iron oxide (rust) in the rocks and dust. The planet's atmosphere is very thin. It is mostly carbon dioxide with some argon and nitrogen and tiny amounts of other gases including oxygen. The temperatures on Mars are colder than on Earth, because it is farther away from the Sun and has less air to keep heat in. There is water ice and frozen carbon dioxide at the north and south poles. Mars does not have any liquid wateron the surface now, but signs of run-off on the surface were probably caused by water. The average thicknessof the planet's crust is about 50 km (31 mi), with a maximum thickness of 125 km (78 mi).

    Mars has two small moons, called Phobos and Deimos. The origin of Mars' moons is unknown and controversial. One theory is that the moons are captured asteroids. However, the moons' near circular orbits and low inclination relative to the Martian equator are not in agreement with the capture hypothesis. Estimates of the mass ejected by a large Borealis-size impact vary. Simulations suggest that a body about 0.02 of Mars mass (~0.002 Earth mass) in size can produce a sizable debris disk in Martian orbit. Much of the material would stay close to Mars.There are several other large impact basins on Mars that could also have ejected enough debris to form the moons.

    Lack of magnetic field

    Mars does not have a global magnetic field. Despite this, observations show that parts of the planet's crust have been magnetized. This suggests that polarity reversals have occurred in the past. This paleomagnetism is similar to the magnetic striping found on Earth's ocean floors. One theory is that these bands suggest plate tectonic activity on Mars four billion years ago, before the planetary dynamostopped working and the planet's magnetic field faded.


    A Martian day is called a sol, and is a little longer than an Earth day. Mars rotates in 24 hours and 37 minutes. It rotates on a tilted axis, just like the Earth does, so it has four different seasons. Of all the planets in the Solar System, the seasons of Mars are the most Earth-like, due to their similar axial tilt. The lengths of the Martian seasons are almost twice those of Earth's, as Mars's greater distance from the Sun leads to the Martian year being almost two Earth years long. Marti...


    A 2015 report says Martian dark streaks on the surface were affected by water. Liquid water cannot exist on the surface of Mars due to its low atmospheric pressure (there's not enough air to hold it in), except at the lowest elevations for short periods. The two polar ice caps appear to be made largely of frozen water. The amount of ice in the south polar ice cap, if melted, would be enough to cover the entire planet's surface 11 meters deep. A permafrostmantle stretches from the pole to lati...

    Our records of watching and recording Mars start with ancient Egyptian astronomers in the 2nd millennium BC. Detailed observations of the location of Mars were made by Babylonian astronomers who developed methods using math to predict the future position of the planet. The ancient Greek philosophers and astronomers developed a model of the solar system with the Earth at the center ('geocentric'), instead of the sun. They used this model to explain the planet's motions. Vedic and Islamic astronomers estimated the size of Mars and its distance from Earth. Similar work was done by Chineseastronomers. In the 16th century, Nicholas Copernicus proposed a model for the Solar System in which the planets follow circular orbits about the Sun. This 'heliocentric' model was the beginning of modern astronomy. It was revised by Johannes Kepler, who gave an elliptical orbitfor Mars which better fit the data from our observations. The first observations of Mars by telescope was by Galileo Galilei i...

    Because Mars is the one of the closest planets to Earth in the Solar System, many have wondered if there is any kind of life on Mars. Today we know that the kind of life, if any, would be some simple bacteria-type organism.

    Mars Profile Archived 2014-04-09 at WebCite by NASA's Solar System Exploration
    Mars Archived 2009-08-10 at the Wayback Machine -
    • 249200000 km, (154800000 mi; 1.666 AU)
    • 227939200 km, (141634900 mi; 1.523679 AU)
    • 206700000 km, (128400000 mi; 1.382 AU)
    • Martian
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  3. The following 24 files are in this category, out of 24 total. Martian meteorites subdivision.svg 603 × 223; 8 KB Martian Meteoritses (15651719446).jpg 800 × 537; 305 KB

  4. Feb 22, 2021 · Martian Meteorite ALH84001 – by Jstuby at English Wikipedia, CC BY-SA 3.0, Besdies ALH84001, Martian meteorites are broadly classified as shergottites, nakhlites, chassignites and ungrouped.

  5. The Martian is a 2015 science fiction film directed by Ridley Scott and starring Matt Damon. Drew Goddard adapted the screenplay from the 2011 novel The Martian by Andy Weir . The film depicts an astronaut's lone struggle to survive on Mars after being left behind, and the efforts of NASA to rescue him and bring him home to Earth .

    • Harry Gregson-Williams
    • September 11, 2015 (TIFF), September 30, 2015 (United Kingdom), October 2, 2015 (United States)
  6. The green-and-white palace has the overall shape of an elongated rectangle, with a 215-metre-long (705 ft) and 30-metre-high (98 ft) principal facade. The Winter Palace has been calculated to contain 1,886 doors, 1,945 windows, 1,500 rooms and 117 staircases. This aerial view of the palace was taken in 2016.

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