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The universe is the totality of all space and time, including all matter, energy, and structures formed by them.
The universe is defined as everything that exists: all forms of matter and energy, and the structures they form, spanning from sub-atomic particles to entire cosmic structures. In this sense, it includes all space and time and everything contained within intergalactic space, such as planets, moons, stars, and galaxies. Some philosophers and scientists also argue that abstract concepts like mathematics and logic may be included in the definition. In cosmology, the universe is also described through its evolution and large-scale properties. The prevailing modern picture is that the universe has been expanding for about 13.8 billion years, beginning from an extremely hot and dense early state associated with the Big Bang. The observable universe is limited by the finite speed of light, and today it is roughly 93 billion light-years in diameter, while the total (overall) size of the universe remains unknown. The term “universe” comes from Old French “univers,” ultimately from Latin “universus,” meaning “combined into one.” The word has been used in related senses throughout history, and it has close synonyms in various traditions and languages, such as “the all” and “the cosmos.”
The universe is the totality of all space and time, including all matter, energy, and structures formed by them.
Modern cosmology describes the universe as expanding for about 13.8 billion years from an early hot, dense state (Big Bang).
The observable universe is limited by the particle horizon (finite light speed), and its current diameter is about 93 billion light-years, while the universe’s total size is unknown.
The universe is everything that exists— all space and time, all matter and energy, and the structures they form.
The portion of the universe from which light (and other signals) has had time to reach us since the beginning of the universe.
The prevailing cosmological model describing the universe’s earliest hot, dense state followed by expansion and cooling.
The maximum distance from which information could have reached us by the present time due to the finite speed of light.
The word comes from Old French “univers,” from Latin “universus,” meaning “combined into one.”
“Can you explain what "The universe is the totality of all space and time, including all matter, energy, and structures formed by them." means in simple terms?”