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Doha (Arabic: الدوحة, ad-Dawḥa or ad-Dōḥa, pronounced [adˈdawħa]) is the capital and most populous city of the State of Qatar. It has a population of 956,460 (2015). The city is located on the shore of the Persian Gulf in the east of the country, North of Al Wakrah and South of Al Khor. It is Qatar's fastest growing city, with over 80 percent of the country's population living in Doha or its surrounding suburbs, and it's the political and economic center of the nation.
Doha was founded in the 1820s as an offshoot of Al Bidda. It was officially declared as the nation's capital in 1971, when Qatar gained independence from being a British Protectorate. As the commercial capital of Qatar and one of the emergent financial centers in the Middle East, Doha is considered a beta-level global city by the Globalization and World Cities Research Network. Doha accommodates Education City, an area dedicated to education and research; Hamad Medical City, an Hamad Medical Corporation administrative area of medical care which includes Hamad General Hospital, Heart Hospital, Women's Wellness and Research Center and Qatar Rehabilitation Institute as well as a number of specialty clinics and support infrastructure.
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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.