: a branch of metaphysics that deals with the nature of the universe. b. : a theory or doctrine describing the natural order of the universe.
2: a branch of astronomy that deals with the origin, structure, and space-time relationships of the universe..
Cosmology studies how the history of the universe led to the stars, galaxies, and other features we can observe today.
Cosmology is the study of the origin, development, structure, history, and future of the entire universe.
In modern science, cosmology is divided into two branches..
: a branch of metaphysics that deals with the nature of the universe. b. : a theory or doctrine describing the natural order of the universe.
2: a branch of astronomy that deals with the origin, structure, and space-time relationships of the universe..
Description: A constellation in modern technical terms is a polygonal segment of the celestial sphere.
The International Astronomical Union has divided the entire celestial sphere into 88 regions - constellations..
Lambda: the upper case Greek Lambda is usually used to denote Einstein's cosmological constant.
A non-zero Lambda indicates a non-zero vacuum energy density and causes a long-range repulsive effect which leads to the accelerating expansion of the Universe..
A-type star In the Harvard spectral classification system
Two bodies of similar mass orbit a common barycenter external to both
coudé spectrograph This is a spectrograph placed at the Coudé focus of a reflecting telescope
debris disk A ring-shaped circumstellar disc of dust and debris orbiting its host star. It is created by collisions between planetesimals
early-type star A hotter and more massive star, in contrast to late-type stars that are cooler and less massive
Cosmology The branch of astronomy that deals with the properties of the universe as a whole — as a single system
Topics that cosmologists think about include the organization, origin, and ultimate fate of the uni- verse
Dark Energy The energy that is causing the expansion of the universe to accelerate (speed up)
It is designed to cover all of astronomy, includingparticle physics and some statistics; in this sense the Glossary is aslight departure from the extragalactic focus of the rest of theknowledge base
It is expected that the Glossary will eventually serve as one of manyentry points into the major holdings of LEVEL5
Cosmology and astrophysics are closely related to astronomy, and the words are sometimes used interchangeably
Cosmology focuses on the Universe’s largest scales in space and time, and astrophysics focuses on the properties and interactions of astronomical objects
atom — A small unit of matter composed of protons, electrons, and usually neutrons