535,749 views
Support Wallet at 0848167027. The universe was born about 13 billion years ago according to the Big Bang theory. In the beginning, the universe was small. Huge energy was packed into matter. According to Einstein's general theory of relativity (E = mc2), when the universe cooled, the first element to occur was hydrogen, which is simply composed of one proton and one electron. Therefore, hydrogen is the most abundant element in the universe. When hydrogen groups together into a large gas group called a nebula, the gravity at the center causes the gas group to collapse until nuclear fusion occurs, fusing hydrogen into helium. Stars are therefore born. When stars burn out all hydrogen, helium fusion occurs, resulting in the next elements: carbon, oxygen, silicon, and iron (arranged in the periodic table). These elements are therefore common elements and found in abundance on Earth. Finally, when a large star dies, it explodes as a supernova. Rare heavy elements are formed next, such as silver and gold. These elements are therefore rare on Earth. The birth and death of stars has occurred many times, and the last time was about 4.6 billion years ago. The gas group in this area of the universe has gathered together into a fire haze called the “Solar Nebula” (Solar means the sun, Nebula means fire haze). Gravity causes the gas group to collapse and rotate on its own axis. The center is very hot, causing a nuclear fusion reaction to occur, becoming a star called the Sun. The surrounding materials have lower temperatures, gathering in layers to become planets orbiting the Sun (Figure 1). The debris orbiting the planets also gathers into moons.