To begin with, star-formation occurs when relatively stable and huge clouds of gases and dust are disturbed by external disturbances such as shock waves from a supernova explosion. This brings some material closer when gravity kicks in, bringing together more of the gases, which accumulate and grow dense to pull in more material.
This process continues till an enormous amount of material has been accumulated, making it dense at the core i.e. the "center" of the gigantic gas cloud, as well as raising the temperatures and pressures there. This is when the star "ignites", meaning that a fusion reaction kicks in, releases the outward-energy required to balance the inner-crushing gravity of the star.
Since the magnitude of the pressures, temperatures, size of the gas clouds etc. involved here are huge, it's impossible to find such phenomena on the earth.
You can view the episode "Extreme Stars" from the series How the Universe Works (Season 1 Episode 4) that were aired on The Discovery Channel for a detailed visual understanding of the Star formation process.
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