The Big Bang Theory, supported by cosmic microwave background radiation and galaxy expansion, strongly suggests the universe had a beginning. Scientists believe that about 13.8 billion years ago, the universe started as a tiny, incredibly hot and dense point. Then, it expanded rapidly in an instant, creating space, time, and all the matter we see today. This idea called the Big Bang Theory, helps explain how the universe began.
One big clue supporting this theory is the cosmic microwave background (CMB) radiation. This is a faint glow of leftover heat from the early universe, which we can still detect today using special telescopes. It’s like the afterglow of the Big Bang, proving that the universe was once much hotter and smaller.
Another strong piece of evidence is galaxy expansion. Scientists have observed that galaxies are moving away from each other, meaning the universe is still growing. If we rewind this motion backward, everything would have once been packed into a single point, just as the Big Bang Theory describes.
While we don’t know exactly what caused the Big Bang, this theory gives us the best explanation so far for how our universe was born and has continued to evolve!
