Friday, December 15, 2006

Computer science

Computer science, or computing science, is the study of the theoretical basics of information and calculation and their execution and application in computer systems. Computer science has lot of sub-fields; a few highlight the calculation of exact consequences (such as computer graphics), whereas others (such as computational complexity theory) relate to properties of computational difficulties. Still others focus on the challenges in applying calculations. For instance, programming language theory studies move toward to describe calculations, whereas computer programming applies precise programming languages to answer precise computational difficulties.

Wednesday, December 06, 2006


Mars (IPA: /ˈmɑɹz/ (GenAm); /ˈmɑːz/ (RP)) is the fourth planet from the Sun in our solar system and is named after Mars, the Roman god of war. Mars is also known as the "Red Planet" due to its reddish appearance when seen from Earth. The prefix areo-, from the Greek god of war, Ares, refers to Mars in the same way geo- refers to Earth.

Mars has two moons, Phobos and Deimos, which are small and oddly-shaped. These may be captured asteroids similar to 5261 Eureka, a Mars Trojan asteroid. Mars can be seen from Earth with the naked eye. Its apparent magnitude reaches -2.9, a brightness surpassed only by Venus, the Moon, and the Sun. For much of the year, Jupiter may appear brighter to the naked eye than Mars.

Until the first flyby of Mars by Mariner 4 in 1965, it was hoped, both within and especially perhaps outside scientific circles, especially in the popular media and literary circles, that Mars had ample liquid water. This was based on observations of periodic variations in light and dark patches, particularly in the polar latitudes, and long dark striations that could perhaps even be irrigation channels of liquid water.