Our Universe as a Dot to Today

Before 13.8 billion years ago our universe was negligible. However, less than 400,000 years ago, it became a high density, highly ionized plasma with a temperature of about 5000 degrees Fahrenheit and a density of about 109 times the current value (1). Then, interesting things have happened. The plasma undergoes a rapid recombination process, protons combine with electrons to form hydrogen, each emitting photons to provide the footprint of the universe of today (2).

Once we become an animal that is not important in African savanna, today we are half a god of this small blue dot in the universe. What came to us? Where are we going? These are the questions Yuval Harari is trying to answer in his book "Homo sapiens: a simple history of mankind". Homo sapiens (our seed) is an animal from man (human) and sapiens species (sage). About five million years ago, human members have evolved in East Africa. This means that when Sapiens first evolved, there were many other human beings on Earth, including the more famous human Neanderthalensis. To tell the truth, from about two million years ago to about 10,000 years ago, several people lived in the world. Only our seeds survive to this day, we do not know well why it will

Hundreds of thousands of years ago, Homo sapiens was only one of a wide variety of people, they were fighting for dominance. There are different kinds of people today as we see different kinds of bears or pigs. Our own ancestors lived mainly in East Africa, but our immediate family Neanderthalensis was familiar as Neanderthal, but lived in Europe. Other species, Homo electas, Asia with high population, and Java Island are the sources of human life. Each species adapts to each environment. Some are big and bad hunters, others are collectors of dwarf plants. There may be differences in each species, so there is evidence that there is an intersection between them. For example, scientists who mapped the Neanderthal genome discovered that the percentage of European genes of Neanderthal's ancestry is less today. (This will be an interesting addition to many genealogies!)

Most physicists now believe that the universe began with the Big Bang. First of all, all the material and energy of the universe was pushed into a small imaginable place and exploded. This comes from the discovery of the expansion of the universe in the early twentieth century. If all galaxies are away they must be together. Inflation theory suggests that after the Big Bang, the universe expanded much faster than the future. This seemingly strange concept was invented by Alan Guth of the Massachusetts Institute of Technology in the 1980's and refined by Andrei Linde of the present Stanford University.