Read Around the Topic - GCSE Physics. Does the Big Bang Provide Enough Evidence for the Origins of the Universe?

Posted on the 27th April

How was our universe created? The secular perspective includes matter and subatomic particles coming together to expand and explode creating the universe. Others argue the non-secular theory with God creating the world in seven days; which ponders towards a more spiritual perspective. As a result, the emphasis of this blog discusses astronomical theories.  

Evidence Supporting the Big Bang Theory

Cosmic Microwave Background: WMAP (fifth year sequence) Dataset | Science  On a Sphere

The Big Bang Theory is the leading explanation for how the universe began. The Big Bang states all current and existing matter around 13.8 billion years ago compacted and exploded creating the universe. There are two fundamental pieces of evidence supporting this theory. Firstly, the redshift of distant galaxies means the universe is likely to be expanding. And the further away an objective is, the more red-shifted light there is. This suggests the further away a galaxy is, the faster it is moving. Astronomers see red-shift in all galaxies, and it is the result of everything expanding. This expansion causes the waves to be stretched, shifting them to the red area of the spectrum. 

The second piece of evidence for the Big Bang includes Cosmic Microwave Background (CMB) radiation in the atmosphere. CMB is a faint glow of light that surrounds the universe. It provides evidence for the Big Bang because it is heat from something created, suggesting an afterglow of a possible explosion that happened. CMB is a mixture of radiation and elementary particles, providing the quintessential outcome of an explosion. These elements surround our universe which reveals strong evidence for a Big Bang. 

What is the Steady State Theory?

Cosmic Times

A second theory for the origins of the universe is the Steady State Theory which explains the universe has always existed. The theory argues the universe is expanding and constantly creating matter as the universe continues to expand. This theory is supported by red-shift evidence because the universe is expanding, though it is not supported by CMB radiation because the theory claims CMB radiation is not everywhere at the same temperature. Ultimately, the Big Bang Theory is the more accepted theory because there is more evidence supporting it. 

Issues with the Astronomical Theories Discussed

At the time of the explosion it is believed the speed of galaxies moving gradually decreased but over time speed has been increasing. The big issue is how can decreasing acceleration turn into increasing acceleration? This is a huge flaw in the theory due to its contradictory nature. A second critique is many galaxies are billions of light-years away from us. This suggests if we look at a galaxy 14 billion light-years away, we are seeing the light from how it existed 14 billion years ago. Therefore, we are looking at an object today which is in fact 14 billion years old and consequently, we have no evidence of what the object is like today – the planet could in fact be non-existent.

Sebastian Owen

27th April

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