NASA's Lucy mission in search of the Jupiter Trojan asteroid aims to uncover the origins of the universe. There are several well-known theories about the formation of the Earth and the sky and their contents.
This question has not been fully answered by researchers. Scientists estimate that the current age of the universe is over 13 billion years. Here are 4 well-known theories about the origin of the formation of the universe, summarized by us from various sources.
1. Big Bang
The Big Bang theory or the Big Bang is the most popular theory and is widely believed to be true to date. This theory was first proposed by Belgian cosmologist Abbe Georges Lemaitre in 1927. He is considered to be the first person to come up with the theory that the universe is constantly expanding.
This theory explains that the universe originated from something super dense and hot which then exploded and expanded about 13.75 billion years ago to become the universe as it is today.
2. Fixed State
Steady-state theory was proposed by H. Bondi, T. Gold, and F. Hoyle of Cambridge University in 1948. According to them, the universe has no beginning and no end, so it always looks the same as it does now. This theory assumes that the universe is infinite in size and age.
Once popular in the early 20th century, this theory is now widely rejected by physicists. The evidence that is considered to break the constant state theory is the microwave background radiation obtained from the Big Bang theory.
3. Nebula Hypothesis
The Nebula Hypothesis, also known as the fog theory, was first proposed by Emanuel Swedenborg in 1734 and refined by Immanuel Kant in 1775.
In general, this theory explains the formation of the Solar System from a giant ball of gas fog. Next, some material is released around the gas ball earlier. Meanwhile, the main gas ball that is still large and hot becomes the Sun, and the other matter that is released becomes dense and cool to form the planet.
4. Twin Stars
The theory of twin stars was put forward in the 1930s by a British astronomer named R. A. Lyttleton. In this theory, it is explained that at first there were twin suns revolving around each other.
One of the Suns was then hit by a passing star, then disintegrated into smaller matter, but still orbited the Sun which was still intact. Over time, the material became a planet around the Sun.
5. Inflate and Compress
The Oscillating Theory or theory expands and compresses put forward by Fred Hoyle, an astrophysicist from England. In this theory, we must understand that new galaxies will always appear and form to replace galaxies that do not exist.
The essence of the theory of expansion and compression is the existence of a cycle that occurs in the universe. Each cycle will experience a mass expansion (expand) and a mass contraction (compress).
Each one cycle takes a long time, which is about 30 billion years. In this theory, the expansion occurs due to the reaction of hydrogen nuclei which will eventually build other, more complex elements.
When the expansion process goes on, galaxies and stars will form. After experiencing expansion, the galaxies and stars will compress which is accompanied by the release of very high heat light.
