Final answer:
The Big Bang theory claims that space, time, matter, energy, and the expansion of the universe originated from the initial explosion. Following these, the Cosmic Microwave Background was formed, and after continuous cooling and expansion, the first stars and galaxies began to form.
Step-by-step explanation:
The Big Bang theory, a key principle in cosmology, proposes that the universe began with a primeval explosion approximately 13.7 billion years ago. This event can be characterized by the creation and development of five key aspects:
- Space and Time: The Big Bang wasn't a typical explosion in a previously existing space; it was the inception of space and time itself.
- Matter and Energy: All of the matter and energy in the universe emerged from the Big Bang. Initial substances included protons, deuterium, helium, and some lithium.
- Expansion: The universe has been expanding since the Big Bang, a process still ongoing today.
- Cosmic Microwave Background (CMB): This is the afterglow of the Big Bang, a kind of radiation that permeates the entire universe.
- Formation of Galaxies and Stars: As mentioned, the universe was initially very hot. However, as it expanded and cooled, matter began to clump together forming the first stars and galaxies about 400-500 million years after the Big Bang.
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