Whenever someone talks about the first stages of life on earth they always start when there are already organisms. Where did those first organisms come from?
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We don’t know. That’s really why people don’t talk about it. We have a pretty good idea of how life evolved from very primitive organisms, but we have no way to really tell where those first organisms came from.
We have a bunch of guesses. It is possible they came to Earth on a meteor that crashed onto the planet (although this doesn’t explain how the first organism *elsewhere* formed). It’s also possible that they formed out of a “primordial soup”. Imagine some prehistoric pond filled with water and ammonia and carbon and other stuff. Hit it with some ultraviolet light (which the sun can supply), and a bunch of simple amino acids and proteins and sugars will form. We’ve done this experiment in a lab and found that it actually produces most of the basic building blocks we’re made of.
And perhaps if you allow this process to continue over millions of years on an entire planet, eventually some of those will randomly combine into the first simple living cell.
But we can’t really tell. All we can say is “it might have happened in this way”.
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