The Big Bang theory is the prevailing scientific explanation for the origin and early development of the universe. According to this theory, the Big Bang was not caused by a fireball; rather, it was the initial rapid expansion of space and the subsequent evolution of the universe.
The precise cause or trigger of the Big Bang is still a subject of scientific inquiry and remains a topic of active research. The theory suggests that the universe originated from a singularity, an extremely hot and dense state, where the laws of physics as we know them break down. However, what exactly triggered the expansion from this singularity into the observable universe is still an open question.
In the early moments after the Big Bang, the universe was in a state of extreme energy and temperature. As the universe expanded and cooled, elementary particles and fundamental forces emerged, eventually leading to the formation of atoms, galaxies, and the vast cosmic structures we observe today.
It's important to note that the concept of a "fireball" is often used as an analogy to help visualize the intense energy and temperature of the early universe. However, the Big Bang was not an explosion in the conventional sense, as there was no pre-existing space or material for it to explode into. Instead, it involved the expansion of space itself, carrying matter and energy with it.