How does a white hole form in nature if it were to exist? No knowledge of general relativity or advanced mathematics but doing a researching a physics project and need a basic explanation.
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A white hole isn't formed. This is the definition. If $t$ is cosmic time, then a white hole is black hole that existed at $t=-\infty$.
Take a look at this Penrose diagram. (Ignore the parallel universe piece.)
The corner where $r=0$ and $r=\infty$ meets is called the past timelike infinity. We see that the white hole existed at that time. For a universe that does not have a beginning (for example no Big Bang), the white hole has always existed.
Ryan Unger
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