President: Mohamed Beji Caid Essebsi Prime Minister: Youssef Chahed
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Solar System was born in a shell made of material flung off a giant star called a Wolf-Rayet star. They burn the hottest of all stars,producing tonnes of elements which are flung off the surface in an intense stellar wind. As the Wolf-Rayet star sheds its mass,the stellar wind ploughs through the material around it,forming a bubble structure with a dense shell. The shell of such a bubble is a good place to produce stars because dust and gas become trapped inside where they can condense into stars. The researchers estimate that 1% to 16% of all sun like stars could be formed in such stellar nurseries. Study addresses a nagging cosmic mystery about the presence of two elements in our solar system compared to the rest of the galaxy. Meteorites left over from the early solar system suggests there was a lot of aluminium-26.In addition,studies increasingly suggest the solar system had less of the isotrope iron-60.According to prevailing theory solar system was formed billions of years...
This refers to a defining movement in early 20th art,pioneered by Pablo Picasso and Georges Braque. The name is based on Henri Matise and Louis Vauxcelles's remark that Georges Braque's painting,Houses at L'Estaque,looked like it was composed of cubes. Cubism rejected the single point perspective that had been in vogue since the Renaissance as well as the need for art to faithfully portray the real world as it was.Instead it celebrated thetwo dimensional nature of the canvas,representing an object from multiple perspectives using planes. Cubism evolved in two stages-analytical cubism and synthetic cubism.
