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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the "Red Planet". The latter refers to the effect of the iron oxide prevalent on Mars's surface, which gives it a reddish appearance distinctive among the astronomical bodies visible to the naked eye. Mars is a terrestrial planet with a thin atmosphere, with surface features reminiscent of the impact craters of the Moon and the valleys, deserts and polar ice caps of Earth.
The days and seasons are comparable to those of Earth, because the rotational period as well as the tilt of the rotational axis relative to the ecliptic plane are similar. Mars is the site of Olympus Mons, the largest volcano and highest known mountain on any planet in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System. The smooth Borealis basin in the northern hemisphere covers 40% of the planet and may be a giant impact feature. Mars has two moons, Phobos and Deimos, which are small and irregularly shaped. These may be captured asteroids, similar to 5261 Eureka, a Mars trojan.Mars has been explored by several uncrewed spacecraft. Mariner 4 was the first spacecraft to visit Mars; launched by NASA on 28 November 1964, it made its closest approach to the planet on 15 July 1965. Mariner 4 detected the weak Martian radiation belt, measured at about 0.1% that of Earth, and captured the first images of another planet from deep space. The Soviet Mars 3 mission included a lander, which achieved a soft landing in December 1971; however, contact was lost seconds after touchdown. On 20 July 1976, Viking 1 performed the first successful landing on the Martian surface. On 4 July 1997, the Mars Pathfinder spacecraft landed on Mars and on 5 July released its rover, Sojourner, the first robotic rover to operate on Mars.
Soria | |
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Soria (Spanish pronunciation: [ˈsoɾja]) is a municipality and a Spanish city, located on the Douro river in the east of the autonomous community of Castile and León and capital of the province of Soria. Its population is 38,881 (INE, 2017), 43.7% of the provincial population. The municipality has a surface area of 271,77 km2, with a density of 144.97 inhabitants/km2. Situated at about 1065 metres above sea level, Soria is the second highest provincial capital in Spain.
Although there are remains of settlements from the Iron Age and Celtiberian times, Soria itself enters history with its repopulation between 1109 and 1114, by the Aragonese king Alfonso I the Battler. A strategic enclave due to the struggles for territory between the kingdoms of Castile, Navarre and Aragon, Soria became part of Castile definitively in 1134, during the reign of Alfonso VII. In Soria was born Alfonso VIII, and Alfonso X had his court established when he received the offer to the throne of the Holy Roman Empire. In Soria, the deposed king James IV of Mallorca died, and John I of Castile married.