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The best explanation for the beginning of the universe so far is the ‘big bang’ when matter was created out of energy in a huge explosion. On Earth, physical conditions arose that happened to lead to life, beginning with a ‘soup’ of increasingly complex organic molecules and inorganic salts, which developed into amino acids and then nucleic acids.
Years of evolution by natural selection (which continues even now) produced human beings, one species amongst the many and various species that exist and have existed. Each individual human is here, of course, because parents conceived that individual. All this is a description of what happened to make it so that we are here, and scientists have explored how we came to be here, finding more and more answers.
For humanists the question of ‘why’ we are here is not a real question. There is no direction or purpose to the universe; no ‘why’ in that sense. Human beings often do things with purposes in mind, with aims and ends in view. But the moon, the sun, the stars – and the universe as a whole and all the natural processes that occur in it – are not the sort of things that can have purposes, aims and ends in mind.