Universe | Definition & Facts | Britannica
2024年12月25日 · This article traces the development over time of humanity’s perception of the universe, from prehistoric observations of the night sky to modern calculations on the recessional velocity of galaxies. For articles on component parts of the universe, see solar system, star, galaxy, and nebula.
Astronomy - Cosmology, Universe, Stars | Britannica
2024年11月17日 · Astronomy - Cosmology, Universe, Stars: 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.
universe - Students | Britannica Kids | Homework Help
The universe is also called the cosmos. Cosmology is the branch of science that studies the universe as a whole. It brings together the natural sciences, particularly astronomy and physics, in a joint effort to understand such aspects as the universe’s origin, …
Expanding universe | Description & Facts | Britannica
2024年11月27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.
Science & Tech | Britannica
There are a lot of strange things in the universe, so why are planets round instead of every shape imaginable? How Fast Is the Universe Expanding? Learn why the Hubble constant doesn’t seem to be very constant.
Cosmology | Definition & Facts | Britannica - Encyclopedia Britannica
2024年12月16日 · Cosmology, the field of study that brings together the natural sciences, particularly astronomy and physics, in a joint effort to understand the physical universe as a unified whole. When the universe is viewed in the large, a dramatic new feature, not present on small scales, emerges—the cosmological expansion.
Science | Definition, Disciplines, & Facts | Britannica
2024年12月27日 · 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 truths or the operations of fundamental laws.
Science in space - Encyclopedia Britannica
2024年12月9日 · Space exploration - Astronomy, Technology, Discovery: In the decades following the first Sputnik and Explorer satellites, the ability to put their instruments into outer space gave scientists the opportunity to acquire new information about the natural universe, information that in many cases would have been unobtainable any other way.
universe summary | Britannica
universe, Whole cosmic system of matter and energy of which Earth is a part. Its main constituents are the galaxies , within which are star s and stellar groupings and nebulae ( see nebula ). Earth’s Sun is one star among the billions of stars in the Milky Way Galaxy .
science - Kids | Britannica Kids | Homework Help
Science includes a wide range of subjects. These subjects can be grouped into three branches: the physical sciences, the life sciences, and the social sciences. Physical Sciences. The physical sciences deal with nonliving things—from the tiny particles …