Counterarguments to Common Christian Arguments

/The Big Bang Theory is only a Theory/

                Is there any evidence for the Big Bang theory? Certainly! In our last chapter, we defined what a "theory" is and what makes a theory valid. Thus, we know that the Big Bang theory is a collection of ideas that attempts to explain the origin of our Universe. Briefly, all cosmic material was once condensed into a singularity that began to rapidly expand outwards about 13.8 billion years ago; this was an event of extreme heat and particle collision. The Universe continues to accelerate outwards, and as it does, entropy increases and temperature decreases.

Those are the most basic ideas behind the Big Bang theory. This theory also relies on facts that are true even if the Big Bang theory is false. One driving fact that led to the acceptance of the Big Bang theory is the redshift. Red light has the longest wavelengths on the electromagnetic spectrum. For about 200 years, astronomers have noticed that the light from galaxies around us is redder than it should be if these galaxies were not in motion. As the galaxies move, then, light waves are stretched in the direction it's not moving to (this process is known as the Doppler effect). It is also true that the amount of red light coming from a galaxy is proportional to how distant it is from Earth: the farther the galaxy is, the redder the light. This led scientists to conclude that the Universe is expanding outwards, and everything—all galaxies and other astronomical bodies—are expanding away from each other.

Once again, the redshift is a fact, whether you accept the Big Bang theory or not. The Big Bang theory just "connects the dots" per se, to form our most accurate representation of how the Universe probably began.