Please read Comparison of smallest thing with that of universe, Speed through the Universe, How are stars formed?, Stars are like factories, Universe has unchanging Laws, Why we cannot see big bang? and Four Ways to Destroy the Universe  before or in conjunction with this article.

Big Bang Nucleosynthesis

Timeline of Universe: Stars and Galaxy formation

This universe was created from nothing. Before creation, there was nothing no planets, stars, heavens and earth. All this is created approx. 13.8 billion years ago from singularity through a bang now scientists call The Big Bang. Since then the universe is expanding continuously. The universe is still in its youth and is expected to live more than 30 billion years. After just one-second old universe became thousand times the size of our solar system. At a temperature of 10 million Kelvin but cold enough for quarks to form protons and neutrons. In next few minutes protons and neutrons bound to form a nucleus. After 380,000 years of the Big bang, the first atom appears. From 380,000 years to 150 million years after Big bang first stars formed. In a billion years time galaxies started forming and then after 9 billion years earth and sun were born.

We Exist Because Of Imperfection

Stars and galaxies formed because of imperfection and lack of order

Stars and galaxies formed because of imperfection and lack of order. If everything all the matter was perfectly aligned and balanced nothing could happen. All happened cause of imperfection that helped gravity to form clusters of matter which then helped in star formation. So if someone says to you that you have made an error a mistake, reply that it is okay as without imperfection we all could not exist.

Heavy Elements The Prerequisite for Life

To create a planet full of life, the Universe needed to create large amounts of the heavy elements required for life. To obtain many of those elements, such as Zinc, Copper, Selenium, Tin and Iodine, you need supernovas to have occurred many times in our galaxy as I told you in Part 19. To get others such as Iron, Potassium, Sulfur and Calcium, you need stars massive enough to create them. But the universe was born only with hydrogen and helium. If all you had was hydrogen and helium, it would be impossible to make a star more massive than about three times the Sun’s mass. And in this scenario, these heavy elements would never be created and spread throughout the Universe. The only reason we can exist, today, is because one little imperfection in the early Universe allows the stars to grow hundreds of times massive than the sun.

We are fortunate, and we need to thank that we live in this time otherwise only 90 years back the knowledge was that there is just one galaxy and that was the whole universe. Now we know that there are billions of galaxies only in the observable universe. Ninety years back universe was static & eternal, but now we comprehend that it had a