Universe | Definition & Facts | Britannica
2024年11月5日 · Unlike the observable universe, the universe is possibly infinite and without spatial edges. Zoom out from Earth's solar system to the Milky Way Galaxy, the Local Group, and beyond Scale of the universe. See all videos for this article.
Astronomy - Cosmology, Universe, Stars | Britannica
4 天之前 · Cosmology is the scientific study of the universe as a unified whole, from its earliest moments through its evolution to its ultimate fate. The currently accepted cosmological model is the big bang. In this picture, the expansion of the universe started in an intense explosion 13.8 billion years ago. In this primordial fireball, the temperature ...
Observable universe | Definition, Size, Description, & Facts
2024年10月23日 · Observable universe, the region of space that humans can actually or theoretically observe with the aid of technology. The observable universe, which can be thought of as a bubble with Earth at its centre, is differentiated from the entirety of the universe, which is the whole cosmic system of.
Scientific Revolution | Definition, History, Scientists, Inventions ...
Scientific Revolution, drastic change in scientific thought that took place during the 16th and 17th centuries. A new view of nature emerged during the Scientific Revolution, replacing the Greek view that had dominated science for almost 2,000 years.
Science | Definition, Disciplines, & Facts | Britannica
5 天之前 · Science, any system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation. In general, a science involves a pursuit of knowledge covering general …
Big-bang model | Definition, Evidence, Videos, & Facts | Britannica
2024年10月21日 · Big-bang model, widely held theory of the evolution of the universe. Its essential feature is the emergence of the universe from a state of extremely high temperature and density—the so-called big bang that occurred 13.8 billion years ago. Learn more about the big-bang model in this article.
Expanding universe | Description & Facts | Britannica
2024年10月17日 · Expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology. The development of general relativity and its application to cosmology, along with the detection of extragalactic redshift, led to the realization in the 1920s that all galaxies are receding.
Solar system | Definition, Planets, Diagram, Videos, & Facts
2024年11月12日 · Unlike the observable universe, the universe is possibly infinite. The Sun, Moon, and brightest planets were visible to the naked eyes of ancient astronomers, and their observations and calculations of the movements of these bodies gave rise …
Physics | Definition, Types, Topics, Importance, & Facts | Britannica
2024年11月5日 · Physics is the branch of science that deals with the structure of matter and how the fundamental constituents of the universe interact. It studies objects ranging from the very small using quantum mechanics to the entire universe using general relativity.
Scientific method | Definition, Steps, & Application | Britannica
2024年10月22日 · Learn how to use the scientific method. The scientific method is critical to the development of scientific theories, which explain empirical (experiential) laws in a scientifically rational manner. In a typical application of the scientific method, a researcher develops a hypothesis, tests it through various means, and then modifies the ...