Noun
English Wikipedia has an article on:Steady State theoryWikipedia
steady state theory (uncountable)
(astronomy) A cosmological model of the universe in which matter is continuously created as the universe expands
The Steady State theory was what Karl Popper would call a good scientific theory: it made definite predictions, which could be tested by observation, and possibly falsified. Unfortunately for the theory, they were falsified. Stephen Hawking