This is one of humanity's oldest questions, and the honest answer is that different frameworks give different answers — science tells one story, religions and philosophies tell others, and they're not all trying to answer the same question.
The scientific account (Big Bang cosmology) About 13.8 billion years ago, the universe expanded from an extremely hot, dense state. There's no "before" in the usual sense — General Relativity breaks down at the first tiny fraction of a second, so what "caused" or "preceded" the Big Bang is currently unknown and may be outside what physics can describe. In the first few minutes, hydrogen, helium, and a trace of lithium formed. Over hundreds of millions of years, gravity pulled that gas into stars and galaxies; stars fused lighter elements into the rest of the periodic table and exploded, seeding new stars and planets. About 4.6 billion years ago, a cloud around a young star collapsed into the Sun and the Earth, and life on Earth began roughly 3.8–4 billion years ago. Note: "the world" specifically is a later chapter in this larger story [nasa].
Religious and philosophical accounts
- Genesis (Abrahamic tradition): God created the heavens and the earth in six days and rested on the seventh. The days are often read as a framework or literary structure rather than literal 24-hour periods.
- Hindu cosmology: The universe cycles through creation, preservation, and dissolution — Brahma emerges from a cosmic egg, a world arises, and after billions of years it dissolves back, repeating.
- Greek philosophy: Anaxagoras proposed a primordial "mind" (nous) that ordered matter; Plato described a Demiurge shaping the cosmos from eternal forms; the Stoics saw a logos — a rational principle — pervading all.
- Indigenous and many traditional accounts generally describe the world emerging from existing substance — earth, water, ancestors, or dreamtime — shaped by supernatural beings, often with humans bearing responsibility to maintain the balance.
The honest middle Science describes how the universe developed from a very early state onward; it deliberately stays silent on why there's something rather than nothing, and on what (if anything) came "before." Religious and philosophical traditions typically address those deeper "why" and "from what" questions. They aren't necessarily in conflict — they're often asking different questions — though specific literal claims (six literal days, a young Earth) do conflict with the scientific evidence.
If you tell me which angle interests you — scientific detail, a particular tradition, or the philosophy-of-science question about "why anything at all" — I can go deeper.