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Luxembourg (Luxembourgish: Lëtzebuerg, French: Luxembourg, German: Luxemburg), also known as Luxembourg City (Luxembourgish: Stad Lëtzebuerg or d'Stad, French: Ville de Luxembourg, German: Stadt Luxemburg, Luxemburg-Stadt), is the capital city of the Grand Duchy of Luxembourg and the country's most populous commune.
Standing at the confluence of the Alzette and Pétrusse rivers in southern Luxembourg, the city lies in the center of Western Europe, located 213 km (132 mi) by road from Brussels, 372 kilometers (231 mi) from Paris, and 209 km (130 mi) from Cologne. The town comprises Luxembourg Castle, established by the Franks in the Early Middle Ages, around which a settlement developed. As of 31 December 2019, Luxembourg City has a population of 122,273 inhabitants, which is more than three times the population of the country's second most populous commune (Esch-sur-Alzette). The city's population includes 160 nationalities.Mars | |
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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.
Prague ( PRAHG; Czech: Praha [ˈpraɦa] (listen); German: Prag, pronounced [pʁaːk] (listen); Latin:...
Yerevan (UK: YERR-ə-VAN, US: -VAHN; Armenian: Երևան [jɛɾɛˈvɑn] (listen), sometimes spelled...
Katowice (UK: KAT-ə-VEET-sə, US: KAHT-, Polish: [katɔˈvitsɛ] (listen); Silesian: Katowicy;...
Vilhena is the easternmost municipality in the Brazilian state of Rondônia. Its population was...