The Big Bang Theory
Scientists believe that the universe began about 15 billion years ago. It was as small as a needle head. Soon it started to expand very fast. It was so fast that it seemed like an explosion. This sudden explosive growth is called the Big Bang. The theory of the Big Bang was first penned down by a Russian and a Belgian scientist - Alexender Friedmann and Abbe Georges Lamaitre, respectively.
Stage 1
The needle head universe suddenly started expanding like an explosion. Great flashes of light and heat were generated. It became a very hot bowl of electrons and other particles.
Stage 2
Slowly, in the next million years, the cluster of particles started to clear up and the cooling process also got initiated. Many tiny particles combined together and filled most of the universe with Hydrogen and Helium Gases.
Stage 3
It too the next billion years to unite the Hydrogen and Helium gases to form giant masses of clouds and thus galaxies were formed. Smaller clusters of these clouds collapsed and the first stars were born.
Stage 4
After 15 billion years of the Big Band, gravity united various clusters of galaxies which contained billions of stars. Space dust united together and formed planets. Earth is one of these planets.
Hi I am having a question, if you are telling that our habitats the earth is formed through a big bang so why can't we just throw a bomb and build a lot of stuff instead of doing so much work and how can you tell that our earth was formed through big bang if yes then who saw it. Please do answer it
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DeleteAstrophysicists have uncovered a great deal of compelling evidence over the past hundred years to support the Big Bang theory. Among this evidence is the observation that the universe is expanding. By looking at light emitted by distant galaxies, scientists have found that these galaxies are rapidly moving away from our galaxy, the Milky Way. An explosion like the Big Bang, which sent matter flying outward from a point, explains this observation.
Another critical discovery was the observation of low levels of microwaves throughout space. Astronomers believe these microwaves, whose temperature is about -270 degrees Celsius, are the remnants of the extremely high-temperature radiation produced by the Big Bang.
Interestingly, astronomers can get an idea of how hot the universe used to be by looking at very distant clouds of gas through high-power telescopes. Because light from these clouds can take billions of years to reach our telescopes, we see such bodies as they appeared eons ago. Lo and behold, these ancient clouds of gas seem to be hotter than younger clouds.
Scientists have also been able to uphold the Big Bang theory by measuring the relative amounts of different elements in the universe. They've found that the universe contains about 74 percent hydrogen and 26 percent helium by mass, the two lightest elements. All the other heavier elements -- including elements common on earth, such as carbon and oxygen -- make up just a tiny trace of all matter.
So how does this prove anything about the Big Bang? Scientists have shown, using theoretical calculations, that these abundances could only have been made in a universe that began in a very hot, dense state, and then quickly cooled and expanded. This is exactly the kind of universe that the Big Bang theory predicts.
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DeleteThe big band theory is really interesting
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