“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.”
The Beginning of Time (1996)
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Stephen Hawking 122
British theoretical physicist, cosmologist, and author 1942–2018Related quotes
Source: Just a Theory: Exploring the Nature of Science (2005), Chapter 4, “Falsificationism: If It Might Be Wrong, It’s Science” (p. 75)
Source: What Is This Thing Called Science? (Third Edition; 1999), Chapter 6, Sophisticated falsification, novel predictions and the growth of science, p. 83

Source: The End of Science (1996), p. 27

Speech at the National Press Club (2004)

“It is a test of true theories not only to account for but to predict phenomena.”
Aphorism 39.
Philosophy of the Inductive Sciences (1840)

Objecting to the placing of observables at the heart of the new quantum mechanics, during Heisenberg's 1926 lecture at Berlin; related by Heisenberg, quoted in Unification of Fundamental Forces (1990) by Abdus Salam ISBN 0521371406
1920s