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The Big Bang Theory
Why is the Universe expanding? What is Cosmic Back Ground Radiation (CBR)? There are many questions asked about our Universe, which we know so little about. Scientists, in their attempt to answer these and other confrontations, have found one idea that seems to explain much of what we don't understand: The Big Bang Theory.
An explosion of incomprehensible speed was the beginning of our known Universe and existence. At that time matter as small as the head of a pin inflated to become larger than the visible Universe of today in less than one millisecond. The newly born Universe cooled very quickly and continued to grow. Still, the heat was too great for normal elementary particles like protons and neutrons to be bound together. Instead, the particles were in their free form and were called quarks. These quarks and the massive amount of radiation released form the explosion made up most of the Universe in the first microsecond.
Within the quarks, matter and antimatter (elementary particles such as protons and electrons, yet with an opposite charge) was distributed in a 2:1 ratio. The matter and antimatter soon began to cancel each other out, for antimatter and matter cannot coexist in close range for more than a few seconds without annihilating each other. Because the matter had more particles then the antimatter, there was a little residue left over. It was this leftover debris that created the galaxies, the stars, the planets, and even you and me.
At this point the Universe was one second old, and it began fusing lighter elements like helium. This nuclear activity only lasted a few minutes, but it is one of the reasons the Universe has an abundance of light elements.
The Universe continued to grow and cool, later fusing the heavier elements and then what we see around us today. All of it began at the Big Bang.
The Big Bang is a well known and believed theory of how the universe was created. It is described as a tremendous explosion that has a certain place and time. In fact, the Big Bang is considered to be the beginning of time as well as the beginning of the universe.
Scientists today, don?t know what happened before the Big Bang. However, they have concluded that if something had happened, it would not have effected the explosion in any way. Most have agreed that what ever there was, or wasn?t before the Big...
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...being blown up. As the balloon becomes larger and larger its front tends to look flat. Apply this idea to the Universe. It is expanding, because of the inflation theory, just like the balloon and appears to be flat when looking straight at it.
The Universe may not always be expanding though. Scientists have come up with three possible fates for the Universe depending on its mass as it continues to grow. If the Universe is not dense enough to utilize gravity, it will keep expanding forever. This is called an open universe. If the density is just right, the universe will continue expanding but will slow down and ultimately stop completely. This is called a flat Universe. The third option has almost been ruled out, but there is always a possibility. If the universe is denser than we think, gravity will eventually become stronger than the expansion, perhaps resulting in the universe collapsing in on itself in a ?Big Crunch?.
We may not know where our Universe is heading, but the Big Bang theory helps us understand where we have come from. Although there are still many unanswered questions, there is plenty of time left in this young Universe, and plenty of places to explore.
In the last hundred years we have made enormous progress in studying not our galaxy but ones billions of light-years away. Only a few hundred years ago our world seemed so big that there were areas of the world that had never been charted and people believed that the Earth was flat (and yes for some reason a few people still believe that today). If we continue to make progress at thus rate the universe will actually begin to seem smaller because of how much more we might know.
Matter, as we conceive it today, did not exist after the Big Bang, because the temperature was too high for that. While trying to join protons and electrons, light continually crossed apart. Only when the universe had cooled to 3,000 K, the atoms are held together and the light was beginning to happen.
Secondly, a quarter of the total mass of the Universe is made up of dark matter which would have been created within the first few minutes of the Big Bang. It surrounds the galaxies and galaxy clusters and assist in the development of construction within the Universe. During the structural construction of the Universe, dark matter which can also be described as “cold, dark matter” was slow
However, this cannot be extrapolated indefinitely. The universe’s expansion helps us to appreciate the direction in which time flows. This is referred to as the Cosmological arrow of time, and implies that the future is -- by definition -- the direction towards which the universe increases in size. The expansion of the universe also gives rise to the second law of thermodynamics, which states that the overall entropy (or disorder) in the Universe can only increase with time because the amount of energy available for work deteriorates with time. If the universe was eternal, therefore, the amount of usable energy available for work would have already been exhausted. Hence it follows that at one point the entropy value was at absolute 0 (most ordered state at the moment of creation) and the entropy has been increasing ever since -- that is, the universe at one point was fully “wound up” and has been winding down ever since. This has profound theological implications, for it shows that time itself is necessarily finite. If the universe were eternal, the thermal energy in the universe would have been evenly distributed throughout the cosmos, leaving each region of the cosmos at uniform temperature (at very close to absolute 0), rendering no further work
For centuries, physicists and philosophers alike have wondered what makes up our universe. Aristotle thought that all matter came in one of four forms: Earth, Air, Fire, and Water. Since then we have come a long way, with the discovery of the atoms and the subatomic particles they are made of. We can even guess at what makes up protons and neutrons. We have since then discovered and predicted the existence of particles other than the atom, such as the photon, neutrino, axion, and many others.
The first of the scenarios I mentioned is The Big Crunch. The Big Crunch is thought to be a consequence of how the universe was formed in the first place. This theory tells us that the universe’s expansion, due to the big bang, is thought to stop its expansion. The scientists exploring this phenomenon think that it may eventually stop expanding and collapse into itself, pulling everything in with it. This will lead to the transformation of the universe to a huge black hole. Going into further detail, it is said that if the universe has large quantities of dark energy then the expansion of our universe could theoretically continue forever. Another valid point is that if our universe were at a loss of dark energy then gravity would have to eventually stop expanding; leading to contractions of the universe, which will continue until the matter of our universe collapses. This specific phenomenon, The Big Crunch, is looked at as a mirror image, or a reverse effect of the big bang. The theory goes on to say how contraction will slow down while the pace of gravity starts to pick up, causing the temperature to increase. When temperature is increasing the stars will eventually ex...
For over a hundred years now a battle has been raging over the origin of the Universe and man. Soldiers of Science have drawn the battle lines with each side using various scientific and non - scientific theories as their weapons.
The Big Bang Theory is one of the most important, and most discussed topics in cosmology today. As such, it encompasses several smaller components that attempt to explain what happened in the moments after creation, and how the universe we know today came from such a fiery, chaotic universe in the wake of the Big Bang. One major component of the Big Bang theory is nucleosynthesis. We know that several stellar phenomena (including stellar fusion and various types of super novae) are responsible for the formation of all heavy elements up through Plutonium, however, after the advent of the Big Bang theory, we needed a way to explain what types of matter were created to form the earliest stars.!
Tate, Karl. "Cosmic Microwave Background: Big Bang Relic Explained (Infographic)." Space.com. TechMedia Network, 3 Apr. 2013. Web. 15 Apr. 2014. .
It all started 13.7 billion years ago in the core of a black hole which contains large amounts of gravitational pressure which can squish very fine particles. After the big bang happened the universe eventually cooled and expanded. Every day the universe expands, so trying to find the end will be impossible. Our universe is similar to filling a balloon with air until expands, while keeping all of its contents inside.
the first instances of the Big Bang. What this means is that during the Big
The Big Bang, the alpha of existence for the building blocks of stars, happened approximately fourteen billion years ago. The elements produced by the big bang consisted of hydrogen and helium with trace amounts of lithium. Hydrogen and helium are the essential structure which build stars. Within these early stars, heavier elements were slowly formed through a process known as nucleosynthesis. Nucleosythesis is the process of creating new atomic nuclei from pre-existing nucleons. As the stars expel their contents, be it going supernova, solar winds, or solar explosions, these heavier elements along with other “star stuff” are ejected into the interstellar medium where they will later be recycled into another star. This physical process of galactic recycling is how or solar system's mass came to contain 2% of these heavier elements.
Generally, the universe began as a composition of radiation and subatomic particles, which proceeded with galaxies formation. Galaxies are made up of hydrogen, helium, 100-200 billions of stars, planets and most having a black hole at the center, which attracts everything present in galaxies by force of gravity. Galaxies can be classified as either spiral (Milky Way- galaxy which human kind has been found to exist), elliptical, lenticular and irregular, where the structure is determined by neighboring galaxies with most galaxies are moving away from each other. Classification of galaxies is being conducted by online programs such as Galaxy zoo, using pictures from telescopes and is making significant progress.
The big bang theory is an attempt to explain how the world began. The big bang theory begins with what is called a “singularity.” This term is used to describe an area in space which defies all the known laws of physics. Singularities are thought to exist at the core of black holes. Black holes are areas of intense gravitational pressure. The pressure is thought to be so intense that matter is pressed together into an infinite amount of pressure. The dense hot mass of the singularity slowly expanded. This process is called inflation. As the singularity expanded the universe went from dense and hot to cool and expansive. Inflation is still continuing on today which means that the universe is continually expanding.
Most scientists agree that there was a beginning but there is a lot of speculation of how it (the universe) actually started. The much-celebrated Greek philosopher, Aristotle, denied the fact that there ever was a beginning. He and his associates believed in the eternal existence of the universe, they also tried to prove that the universe was static, and was unchanging in time. However, there is evidence, which suggests that the universe is changing with time.