Draft:Outline of the universe

The following outline is provided as an overview of and topical guide to the universe:

The universe is all of space and time and their contents. It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of energy and matter, and the structures they form, from sub-atomic particles to entire galaxies. Space and time, according to the prevailing cosmological theory of the Big Bang, emerged together 13.787±0.020 billion years ago, and the universe has been expanding ever since. Today the universe has expanded into an age and size that is physically only in parts observable as the observable universe, which is approximately 93 billion light-years in diameter at the present day, while the spatial size, if any, of the entire universe is unknown.

Below is a structured list of topics describing the universe:

What type of thing is the universe?

The Universe can be described as all of the following:

Chronology of the universe

Chronology of the universe

• Graphical timeline from Big Bang to Heat Death