Universe - Wikipedia
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
Human understanding of what the universe is, how it works and how vast it is has changed over the ages. For countless lifetimes, humans had little or no means of understanding the universe. Our distant ancestors instead relied upon myth to explain the origins of everything.
What is the universe? - Live Science
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.
Universe - NASA Science
Discover the universe: Learn about the history of the cosmos, what it's made of, and so much more. Worlds beyond our solar system. In 2005, NASA’s Spitzer mapped a ring of dust around Vega, one of the brightest stars in the northern sky.
Universe | Definition & Facts | Britannica
2 天之前 · 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.
Overview - NASA Science
Here is the history of the universe according to cosmologists’ current theories. Around 13.8 billion years ago, the universe expanded faster than the speed of light for a fraction of a second, a period called cosmic inflation. Scientists aren’t sure what came before inflation or what powered it.
The origins of the universe facts and information - National …
2024年8月16日 · How did the universe begin—and what were its early days like? The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the big bang.
The Universe - NASA+
5 天之前 · 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
The Universe | Facts, Information, History & Definition - The Nine Planets
2020年8月19日 · However, the observable universe is around 93 billion light-years with a radius of around 46.5 billion light-years. The universe’s density is equivalent to 5 protons per cubic meter of space. The universe is made up of 4.9% ordinary (baryonic) matter, 26.8% dark matter, and 68.3% dark energy.
The Universe - Universe Today
2017年5月11日 · So what is the Universe? Well, the short answer is that it is the sum total of all existence. It is the entirety of time, space, matter and energy that began expanding some 13.8 billion years ago...