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Spacecraft propulsion is any method used to accelerate spacecraft and artificial satellites. In-space propulsion exclusively deals with propulsion systems...

In cosmology, a static universe (also referred to as stationary, infinite, static infinite or static eternal) is a cosmological model in which the universe...

David D. Balam /ˈbeɪləm/ is a Canadian astronomer and a research associate with University of Victoria's Department of Physics and Astronomy, in Victoria...

A balloon satellite, sometimes referred to as a "satelloon", is a satellite inflated with gas after it has been put into orbit. The first flying body of...