Process of speculation

Big bang theory (something out of nothing)

APRIL 2008 ISSUE DISCOVRY MAGAZINE

3 Theories That Might Blow Up the Big Bang

Spontaneous generation 1700-1800

An obsolete body of thought on the ordinary formation of living organisms.

Phlogiston theory 1667

The phlogiston theory is an obsolete scientific theory that postulated a fire-like element called phlogiston, contained within combustible bodies and released during combustion.