Universe - Wikipedia
网页The universe is all of space and time [a] and their contents. [10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments.
What is the Universe? - NASA Science
网页The universe is nearly 14 billion years old, our solar system is 4.6 billion years old, life on Earth has existed for maybe 3.8 billion years, and humans have been around for only a few hundred thousand years. In other words, the universe has existed roughly 56,000 times longer than our species has.
Universe | Definition & Facts | Britannica
网页2024年9月13日 · universe, the whole cosmic system of matter and energy of which Earth, and therefore the human race, is a part. Humanity has traveled a long road since societies imagined Earth, the Sun, and the Moon as the main objects of creation, with the rest of the universe being formed almost as an afterthought. Today it is known that Earth is only a ...
Universe - NASA Science
网页Discover the universe: Learn about the history of the cosmos, what it's made of, and so much more.
What is the universe? - Live Science
网页2022年5月3日 · The universe is literally everything, the sum of all existence. It includes all matter, like stars and galaxies. The universe also includes all radiation and all other forms of energy. No...
The origins of the universe facts and information - National …
网页2024年8月16日 · The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the big bang.
Overview - NASA Science
网页The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries. New ideas and major discoveries made during the 20th century transformed cosmology – the term for the way we conceptualize and study the universe – although much remains unknown.
The history of the universe: Big Bang to now in 10 easy steps
网页2022年2月2日 · The history of the universe and how it evolved is broadly accepted as the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago....
The Universe - NASA+
网页2024年9月13日 · Discover how the universe works, explore how it began and evolved, and search for life on planets around other stars as we seek to understand the universe and
Universe | HubbleSite
网页2023年6月2日 · By allowing scientists to study the origins of the universe, the earliest galaxies and the mysterious, repulsive force known as dark energy, Hubble is helping to answer age-old questions such as Where did we come from? and How will the universe end? What Is the Big Bang?
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