The Expansion of the Universe

Big Bang theory began 15 million years ago, it is a huge explosion, it is still expanding; it will never stop the expansion. Big Bang theory is the best explanation of how science creates the universe. The Big Bang theory is based on the fact that our entire universe is made by these small ones (they are billions times smaller than the small protons) and begins to expand rapidly, eventually cooling us and forming stars I tell you many galaxies we know well.

The universe is huge and constantly expanding. Since the universe is expanding at increasing rates, the speed at which distant galaxies move away from the observer increases with time. The expansion of the universe is thought to accelerate about 5 billion years after the universe enters the dominant region of its dark energy. Our solar system starts with our star, the sun. Beginning with Mercury, the sun places all the planets within their gravity range. Venus, the earth, Mars are rocky planets in the asteroid belt. There are many asteroids in the asteroid belt. After that, a series of gaseous planets such as Jupiter, Saturn, Uranus, Neptune etc. appeared. Countless comets are the remains of the solar system. The sun also exerts gravity on them. By this, many nebulae called Oort clouds were born. This is what we call the solar system. The next stop next to our address is the Milky Way

In order to understand how the expansion rate varies in space-time space, high-precision measurement of the expansion of the universe is necessary. In general relativity, the expansion rate expansion is estimated from the curvature of the universe and the state equations of the universe (temperature, pressure, and the energy of arbitrary spatial domain, the relationship between energy and vacuum energy density). Measuring state equations of dark energy is one of the greatest efforts in today's observational cosmology. Adding cosmological constants to the standard FLRW metrics of cosmology derives the Lambda-CDM model. This is exactly the same as the observation, so it is called the "standard cosmology model".

Through chaotic scientific process, one of the big achievements of cosmology is the Big Bang model of the origin of the universe. It represents the expansion of the universe from only 10 seconds to 43 seconds. At that stage of 1.38 billion years ago the universe was a very dense mass, it was small, it was able to pass through the eye of the needle. On Job, the Lord said, "Where are you when I build the foundation of the world" - people can ask questions of the same cosmologist! But this detective story that collects evidence and builds the best model is very effective. Three pieces of evidence are important. First, V. Slipher and Edwin Hubble at the beginning of the 20th century observed that light from other galaxies shows a phenomenon called redshift. This happens when light is emitted from objects far away from us.