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The universe is the space which contains all the galaxies, stars, planets, moons, living organisms and every thing. The sun and the earth are a tiny part in the universe. In the universe, groups of stars are gathered to form galaxies. The universe contains many galaxies and each galaxy has a distinctive shape according to harmony and order to groups of stars in it The sun is one of stars of our galaxy (milky way) The Milky Way Galaxy: In the center of the galaxy a lot of old stars gather surrounded by small stars located in the spiral arms of the galaxy. Our sun is a star of millions of stars in this galaxy. The universe: It is a wide and extended space that contains galaxies. The number of galaxies in the universe is about 100,000 million galaxies. Galaxies: Galaxies gather in clusters including the milky way which contains the sun. The Milky Way: It contains the sun and the solar system. The milky way is given that name because it appears in the sky at night as a splashing milk or spreading straw. The solar system: It is the sun and eight planets revolving around it The earth: The planet of life. The solar system: Planets around the sun and the surrounding planets revolve around the center of the galaxy (Milky Way). The sun takes about 220 million years to complete one rotation around the center of the galaxy. The solar system is located in one of the spiral arms of the milky way on the edge of the galaxy. Measuring the distance through the universe: The distance between stars are very large, so the distance in the far space are not measured in kilometers, but they are measured in a unit called “light year”. Light year: It is the distance covered by light in one year and it is equal 300000 km per second, this distance is 946000 million km. 1-The Big Bang: 1- through the big bang: The process of expansion and changing of the gaseous ball components started and it continues to this day 2-Through 1 second after explosion: The temperature decreased to about 10 000 million (10 billion) Degrees. 3- Within minutes after the explosion: The atomic particles produced from explosion merged together producing gaseous clouds of hydrogen and helium with a ratio of 75% : 25% respectively. 4-After 1000 million (1 billion) years from the big bang: The gaseous clouds merged forming homogenous masses which will produce the matter of galaxies. 5- within 2000 : 3000 million (2 : 3 billion ): years from the big bang: The gravity helped in gathering of more masses forming “ancestral galaxies” leaving areas of empty space between them. After 3000 million years from the big bang: Galaxies began to form. After 5000 million years from the big bang: Our galaxy the milk way took its disc form. After 10,000 million years from the big bang: The sun was born. Then the earth and planets were created. After 12000 million years from the big bang: Earliest life forms began to appear on the earth. After 15000 million years from big bang: The universe as it now.