The big bang is the most accepted theory about the origin of this universe. About 14 billion years ago, the Universe materialized out of nothing for unknown reasons. Infinitely smaller than an atom, to begin with, the Universe expanded to billions of miles across In under a second-an event called the Big Bang.
The Universe began as something called a singularity: a point of zero size but infinite density.
10 important point of The Big Bang
1. The universe appears out of nowhere. At the start, the Universe consists purely of energy and is infinitely dense and unimaginably hot- 18 billion trillion Fahrenheit.
2. Within a tiny fraction of a second, the Universe balloons in size from trillions of times smaller than an atom to the size of the city. The rate of expansion then slows.
3. The Intense energy of the newborn Universe creates matter. At first, the matter is a soup of particles and antiparticles. These crash into and cancel each other out, turning back into energy. But some of the matter is left over-this will eventually turn into atoms and later stars and galaxies.
4. The Universe is now about 1 microsecond old and 60 billion miles (100 billion km) wide. The leftover particles begin to form protons and neutrons- the particles that today make up the nuclei of atoms to form yet light cannot pass through the sea of particles, so the young Universe resembles a dense fog.
more exceeding evidence of the Big Bang came in the 1960s when astronomers detected faints microwave radiation coming from every point in the sky. This mysterious energy is the faded remains of the intense burst of energy released in the Big Bang.
5. The first scientific evidence for The Big Bang was found in 1929 when astronomers discovered that light from distant galaxies is reddened. The color change happens when object are moving away from us, making lightwaves stretch out and change color.
6. For hundreds of millions of years, the Universe consisted almost entirely of hydrogen and helium- they very simplest chemical elements. After stars appeared new elements began to be made in the cores of dying stars. All the complex elements in our bodies were forged in dying stars this way.
7. At 500 million years ago first galaxies are forming. Galaxies are enormous clouds of stars held together by gravity.
8. Now 5 billion years old, the Universe consists of vast clusters of galaxies arranged in the threads, with gigantic voids between them.
9. Our solar System forms at 9 billion years. When the Universe is 20 billion years old, the sun will expand in size and destroy Earth.
10. The universe will carry in expanding forever, becoming cold and dark everywhere.
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