In this chapter we enter into the domain of extra-galactic cosmology and discuss the big bang theory and the evidence for an expanding universe. We illustrate how scientists construct theoretical models that are mistaken for reality by millions of people who encounter them in authoritative textbooks and in popular presentations. We show, however, that even within the narrowly defined domain of astrophysics, new observations may arise that fundamentally challe
In this chapter we enter into the domain of extra-galactic cosmology and discuss the big bang theory and the evidence for an expanding universe. We illustrate how scientists construct theoretical models that are mistaken for reality by millions of people who encounter them in authoritative textbooks and in popular presentations. We show, however, that even within the narrowly defined domain of astrophysics, new observations may arise that fundamentally challe