Abstract

Physical parameters of stable galaxies produce sufficient repulsion to overcome gravitational attraction between them [6]. However, those very large gatherings of 3D matter bodies and debris in space, which do not develop into stable galaxies (or which constitute central parts of stable galaxies, with lower centrifugal actions) succumb to gravitational attraction between constituent matter bodies and form very large single macro bodies of very high matter-density. Huge size and very large matter content of these macro bodies give them certain logical properties, one of which is to reduce/prevent outward radiation (of light) from the zone of their existence, to reach outside observers. This phenomenon makes them invisible and hence the name, ?Black Hole?. This article briefly describes their development, properties and their role in maintaining a ?steady state? of universe, as envisaged in ?Hypothesis on MATTER?.