Throughout time we have asked ourselves these questions:How did our universe begin? How old is our universe? How did matter come to exist? Obviously, these are not simple questions and throughout our brief history on this planet much time and effort has been spent looking for some clue.
Big Bang theory:
About 13.7 billion years ago a tremendous explosion started the expansion of the universe. This explosion is known as the Big Bang. The big bang theory is an effort to explain what happened at the very beginning of our universe. Around 13.7 billion years ago our universe is thought to have begun as an infinitesimally small, infinitely hot, infinitely dense, something - a singularity. After its initial appearance, it apparently inflated, expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe. It continues to expand and cool to this day and we are inside of it. Imagine a giant explosion, a balloon expanding: an infinitesimally small balloon expanding to the size of our current universe
Georges Lemaitre a Belgian physicist and Roman Catholic priest predicted that the recession of the nebulae was due to the expansion of the universe he called it his 'hypothesis of the primeval atom which later was named as the Big Bang Theory
What happened after Big Bang?
In the infinitesimal fractions of the first second after creation what was once a complete vacuum began to evolve into what we now know as the universe. In the very beginning there was nothing except for a plasma soup. Immediately after the Big Bang, the universe was tremendously hot as a result of particles of both matter and antimatter rushing apart in all directions. As it began to cool, at around 10-43 seconds after creation, there existed an almost equal yet asymmetrical amount of matter and antimatter. As these two materials are created together, they collide and destroy one another creating pure energy. As a direct result of an excess of about one part per billion, the universe was able to mature in a way favorable for matter to persist. As the universe first began to expand, this discrepancy grew larger. The particles which began to dominate were those of matter. They were created and they decayed without the accompaniment of an equal creation or decay of an antiparticle.
As the universe expanded further, and thus cooled, common particles began to form. These particles are called baryons and include photons, neutrons, electrons and quarks would become the building blocks of matter and life as we know it. After the universe had cooled to about 3000 billion degrees Kelvin, a radical transition began which has been likened to the phase transition of water turning to ice. Composite particles such as protons and neutrons, called hadrons, became the common state of matter after this transition. Still, no matter more complexes could form at these temperatures. Although lighter particles, called leptons, also existed, they were prohibited from reacting with the hadrons to form more complex states of matter. These leptons, which include electrons, neutrinos and photons, would soon be able to join their hadron kin in a union that would define present-day common matter.
After about one to three minutes had passed since the creation of the universe, protons and neutrons began to react with each other to form deuterium, an isotope of hydrogen. Deuterium, or heavy hydrogen, soon collected another neutron to form tritium. Rapidly following this reaction was the addition of another proton which produced a helium nucleus. Scientists believe that there was one helium nucleus for every ten protons within the first three minutes of the universe. After further cooling, these excess protons would be able to capture an electron to create common hydrogen. Consequently, the universe today is observed to contain one helium atom for every ten or eleven atoms of hydrogen.
While it is true that much of this information is speculative, as the universe ages we are able to become increasingly confident in our knowledge of its history. By studying the way in which the universe exists today it is possible to learn a great deal about its past. Much effort has gone into understanding the formation and number of baryons present today. Through finding answers to these modern questions, it is possible to trace their role in the universe back to the Big Bang. Subsequently, by studying the formation of simple atoms in the laboratory we can make some educated guesses as to how they formed originally. Only through further research and discovery will it be possible to completely understand the creation of the universe and its first atomic structures, however, maybe we will never know for sure.
Big Bang Experiment:
It was the first of many steps for the Large Hadron Collider, a massive physics experiment built at a cost of $3.8 billion and with a total expected cost of over $9 billion.
Large Hadron Collider (LHC), will collide protons together at the highest energies ever achieved, recreating the conditions that existed a fraction of a second after the 'Big Bang' at the start of the universe.
kilometer long circular beam tunnel at just a fraction under the speed of light.The next stage will be to send another beam flying in the opposite direction. Later the particles will be made to smash into each other at energy levels up to seven times higher than any seen before. The collisions, in four
huge detectors arranged around the ring, will create conditions as tightly squeezed and hot as they were less than a billionth of a second after the Big Bang which gave birth to the universe.The vast circular tunnel - or "ring" - which runs under the French-Swiss border contains more than 1,000
cylindrical magnets arranged end-to-end. The magnets are there to steer the beam around this vast circuit. Eventually, two proton beams will be steered in opposite directions around the LHC at close to the speed of light, completing about 11,000 laps each second.At allotted points around the tunnel, the beams will cross paths, smashing
together near four massive "detectors" that monitor the collisions for interesting events. Scientists are hoping that new sub-atomic particles will emerge, revealing fundamental insights into the nature of the cosmos.Engineers injected the first low-intensity proton beams into the LHC in August. But they did not go all the
way around the ring. Technicians had to be on the lookout for potential problems. Steve Myers, head of the accelerator and beam department, said: "There are on the order of 2,000 magnetic circuits in the machine. This means there are 2,000 power supplies which generate the current which flows in the coils of the magnets." If there was a fault with 
any of these, he said, it would have stopped the beams. They were also wary of obstacles in the beam pipe which could prevent the protons from completing their first circuit.In order to get both beams to circulate continuously, engineers will "close the orbit". The beams themselves are made up of several
"packets" - each about a meter long - containing billions of protons. The protons would disperse if left to their own devices, so engineers use electrical forces to "grab" them, keeping the particles tightly huddled in packets. Once the beams are captured, the same system of electrical forces is used to give the particles an energetic kick, accelerating them to greater and greater speeds. 
Anticipated Drawbacks: 
Some say that there is quite a possibility that it may create Black holes and these little black holes survive and will grow exponentially and eat the planet from the inside.
