Hi guys! We are Mark and Billbert. Today we will be teaching you about the Big Bang! The big bang is the broadly accepted theory of how the universe was created. All the trees, all the people, and even all the planets!

It all started with a very small dot, holding a lot of energy. This dot's name is Universe. One day, Universe had a huge growth spurt. So great, that it only took a hundredth of a billionth of a trillionth of a trillionth of a second! All the energy from this mighty expansion shot out. And wherever it traveled created brand new space. Universe’s growth spurt, is known as the Big Bang. He grew exponentially and doubled in size at least 90 times! Universe was becoming a big boy now!

After the energy and heat from the explosion shot out, Universe was very hot! Light chemical elements were created within the first three minutes of his formation.  During this time, there was so much heat that, neutrons and protons started to join. However, our poor friends electrons were not able to join just yet, so we could only create ions, not atoms. Within the very first 3 minutes, hydrogen (75%), helium (25%), and a tiny bit of lithium was created.

For the very first 380,000 years after the big bang, it was way too hot for fully developed atoms to form. In fact, light was not even able to shine during this time, because when photons were released, they would immediately collide or get absorbed by an electron, since there were so many electrons, that there was no space for photons to travel. Poor Johnny the electron was not able to join his friends Harry the proton, and Tom the neutron.

So, 380,000 years after the big bang, Universe was cool enough to start to start having full atoms! Johnny was finally able to join Harry and Tom, and attach to an atom, and so were all of his brothers, and sisters. Ions were converting into atoms.

From 380,000 years, to 200 million years after the big bang, not much was happening. However, overtime, as gas clouds collapsed together through the force of gravity, two hundred million years after the big bang, our very first star was formed.

As many different supernovae occur, which is when a star explodes, the effect of a supernova caused a clouds of dust and gas too collapse, eventually forming into disk like shapes, leading to the formation of the first galaxies. This happened one billion years after the big bang!