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Nobody knows for certain what happened before the Big Bang exploded, or why it exploded when it did explode. Astronomers have determined much of what happened back to the Big Bang, but, Nobody knows anything, about what happened before the massive explosion that started the universe we live in now, and for the last billions of years. There are countless unanswered questions about the pre Big Bang universe that might never be answered.
tiny particle, which then exploded forming the universe
True
The big-bang theory because it is about an atom that exploded and made the whole universe.
The entire OBSERVABLE Universe must have been smaller than the size of a proton. Since the ENTIRE Universe is much larger, and perhaps infinite, we really don't know how large that was.
We have glaxies because our universe exploded.
The big bang all the matter of the universe was compacted in a very small thingy and then it exploded and we have the universe
Nobody knows for certain what happened before the Big Bang exploded, or why it exploded when it did explode. Astronomers have determined much of what happened back to the Big Bang, but, Nobody knows anything, about what happened before the massive explosion that started the universe we live in now, and for the last billions of years. There are countless unanswered questions about the pre Big Bang universe that might never be answered.
tiny particle, which then exploded forming the universe
True
The most used expression is big bang.
'Singularity' ; a moment when energy exploded and matter was created.
The big-bang theory because it is about an atom that exploded and made the whole universe.
The first supernova was probably about 450 million years after the big bang, when the first, massive stars (Population III stars) exploded filling the Universe with the first heavy elements. These elements were "absorbed" by population II stars, which again exploded as supernovae. These metal enriched stars populated the Universe with the rest of the known elements. So supernova were around well before life on Earth. In fact without supernovae there would be NO life on Earth.
If Chuck Norris exploded there would be nothing left in the universe
The " Big Bang "
Oxygen was created by fusion in the cores of stars and distributed through the universe when those stars exploded.