First, there was nothing. Nothing but a tiny little speck that was unimaginably small, and unimaginably hot. That little speck was the universe. In that little speck, the four fundamental forces (electromagnetism, gravitation, weak and strong nuclear interaction) are all combined as a superforce.
Then, suddenly, it exploded. The universe then entered the Planck Era. In this era, temperatures were still high enough for the fundamental forces to still exist in together in a superforce. After, the universe entered the Grand Unified Era. In this era, the temperature started cooling, and the one of the forces separated from the superforce. That force was gravity. But the other forces still were combined. The forces that were still combined were known as the Grand Unified Force.
After that, the universe entered the Electroweak Epoch. In this short and brief period, the strong nuclear interaction separated from the electroweak force (the term for the combination of the electromagnetism and the weak nuclear interaction). Then it enters the Inflation Era. in this era, the universe started expanding significantly.
By the way, keep in mind that all of this happened in less that one second. MIND BLOW.
About 3 minutes later, the universe cools down enough for atomic nuclei to form. The element hydrogen forms. Some hydrogen atoms fuse to form helium.
After 380,000 years later, the universe goes into the Photon Epoch. Photons form and light travels through the darkness.
After 1 billion years later, the first stars and quasars form (for one of the oldest stars, click here), producing heavier elements such as nitrogen, oxygen, carbon, etc. A few billon years later, galaxies formed. After about 12 billion years later, here we are. The universe kept on making more stars and galaxies...until its death.
Want to know the fate of the universe? Well, I already posted something about it. Go ahead and take a look at it. Here's the link: http://thefalconpawncher.blogspot.com/2012/12/universes-fate.html
Interesting fact of the day: If any bird was put in a "zero-gravity" area, they wouldn't survive because birds need gravity to swallow prey. Wow. Just wow.
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