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The functions of this uniquely masculine Chrono-Matic 49 watch from Breitling are hours, minutes, small seconds, date and chronograph. These functions are cleverly set out on a cool black dial with luminescent obelisque hour and minute hands, luminescent

The Sun is our primary driver. entire cultures were based on the sun. This massive fire called a star is as important as air and water. Infographics - the Sun (Solar System): includes general description and observation tips

These oxygen-rich supernovas are of great interest to astronomers because they are one of the primary sources of the heavy elements (that is, everything other than hydrogen and helium) necessary to form planets and people.