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In cosmology, the steady-state theory holds that the universe is constantly expanding while maintaining a constant average density, with matter continuously being created to form new stars and galaxies at the same rate that older ones become unobservable due to their expanding distance and accelerating recession.

The Steady-State Theory is a theoretical framework for cosmology that assumes that the universe is expanding continuously while maintaining a constant average density. According to this universe theory, matter is being generated to build new galaxies and stars at the same rate that the old ones are being destroyed.

To offset the overall change in density, their relative separations and recession velocities increase. A Steady-State Theory universe in a constant state has neither beginning or finish overall. On a large scale, the average density and arrangement of galaxies are constant regardless of the position in our field of vision. The endless generation of matter is explained in this scenario by the fact that the matter density in the expanding space-time remains constant.

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