The following outline is provided as an overview of and topical guide to the universe:
The universe comprises all of existence: all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments. Since the early 20th century, the field of cosmology has established that the universe has been expanding for 13.8 billion years, starting from a dense fireball in an event called the Big Bang. The observable portion of the universe is approximately 93 billion light-years in diameter at present. The total size of the universe is not known.
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:
- Everything – all that exists.
- The cosmos
Fields that study the universe
- Fields that study the cosmos
- Fields that study reality (everything)
Chronology of the universe
General universe-related concepts
Universe-related organizations
Universe-related publications
Persons influential in the study of the universe as a whole
See also
References
External links