Difference between revisions of "Mars"
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| − | {{Planet | + | {{Infobox Planet|image=Mars Viking.jpg |
| − | + | |caption=Mars photographed by [[Viking Orbiter]]s | |
| − | | image=Mars Viking.jpg | + | |symbol=Mars symbol.svg |
| − | | caption=Mars photographed by [[Viking Orbiter]]s | + | |discname=Known to ancients |
| − | | symbol=Mars symbol.svg | + | |origname=Roman god of war |
| − | | order=4 | + | |order=4 |
| − | | | + | |primary=Sun |
| − | | | + | |periapsis=206,644,545 km (1.381 AU) |
| − | | mass=6. | + | |apoapsis=249,228,730 km (1.666 AU) |
| − | | | + | |semimajor=227,936,637 km (1.524 AU) |
| − | | | + | |bode=1.6 AU |
| − | | | + | |circumference=1,429,033,627 km |
| − | | moons=2 | + | |eccentricity=0.093 |
| − | | composition=Rock | + | |sidereal=686.96 da (1.881 a) |
| − | | color=Red | + | |synodic=779.96 da (2.135 a) |
| − | | albedo=0.15 | + | |orbitspeed=24.077 km/s |
| − | + | |inclination=1.851° | |
| − | + | |reference=the ecliptic | |
| − | + | |siderealday=24.62296194 h (1.026 da) | |
| − | + | |solarday=24.65979 h (1.027 da) | |
| + | |rotatespeed=465.11 m/s | ||
| + | |axialtilt=25.19° | ||
| + | |mass=6.4185 * 10<sup>23</sup> kg (10.74% earth) | ||
| + | |density=3,943 kg/m³ | ||
| + | |surfacegrav=3.72 m/s² (0.379 ''g'') | ||
| + | |escapespeed=5.02 km/s | ||
| + | |equatorradius =3402.5 km | ||
| + | |surfacearea=144,800,000 km² (28.388% earth) | ||
| + | |mintemp=186 K | ||
| + | |meantemp=227 K | ||
| + | |maxtemp=268 K | ||
| + | |moons=2 | ||
| + | |composition=Rock | ||
| + | |color=Red | ||
| + | |albedo=0.15 | ||
}} | }} | ||
'''Mars''' is the fourth planet from the [[Sun]], after [[Mercury]], [[Venus]], and [[Earth]]. It is called "The Red Planet" because it looks red from Earth. | '''Mars''' is the fourth planet from the [[Sun]], after [[Mercury]], [[Venus]], and [[Earth]]. It is called "The Red Planet" because it looks red from Earth. | ||
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{{Solarsystem}} | {{Solarsystem}} | ||
| − | + | [[Category:Astrology]] | |
Revision as of 21:01, February 9, 2008
Template:Infobox Planet Mars is the fourth planet from the Sun, after Mercury, Venus, and Earth. It is called "The Red Planet" because it looks red from Earth.
The planet has been known since Antiquity. Because of this, the planet was named after the Roman equivalent of Ares, the Greek god of war.
Mars has two moons: Phobos and Deimos (which respectively mean "Fear and "Panic" in Greek). Russian scientists in the 1950s posited that Phobos might be hollow, but these claims were discredited in the late 1960s.
There is a dichotomy on the surface of Mars; the northern hemisphere consists of low-lying volcanic plains, with the southern hemisphere consists of ancient, heavily-cratered highland plains. Mars also has two volcanic regions: Tharsis and Elysium. Within the Tharsis region is the largest volcano in the solar system, Olympus Mons. Olympus Mons is approximately 500 km across and is about the same size as the state of Arizona. Its peak is 24 km above the surrounding plains and it is surrounded by a vertical scarp 6 km high. A large canyon system, Valles Marineris, is located along the Martian equator east of the Tharsis region. Valles Marineris is 2-6km deep and 200-600km wide and approximately 4,500 km long (approximately the distance from San Francisco to Boston). The eastern part of Valles Marineris appears to have a tectonic origin, but the western part is characterized by features such as teardrop islands and longitudinal grooves, indicating it may have been formed by catastrophic flooding in the past. Such flooding may be possible under current climate conditions. Run-off channels in the cratered highland indicate a thicker atmosphere or warmer climate in the past that would have allowed water to be stable on the surface.
Recent satellite imagery has shown that Mars has a 3 kilometer deep ice cap around its polar regions. The northern polar region is surrounded by dune fields. During the Martian winter, a layer of carbon dioxide condenses at the poles and sublimates in the summer, leaving the water-ice and dust polar caps exposed. The ratio of dust to water-ice contained in the polar caps remains unknown.
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