Changes

|url=

|url=

|isbn=978-0-7459-5371-7

|isbn=978-0-7459-5371-7

|quote=Apart from the obvious fact that no one observed [the origin of the universe], scientists think of the Big Bang as a singularity in the past, an unrepeatable event;...}}</ref> and that has no ''natural'' explanation. Most frequently the term is used in connection with the origin of the [[universe]]. When scientific principles were first being developed into the [[scientific method]], scientists like [[Francis Bacon]], [[Johannes Kepler]], [[Isaac Newton]], and [[Lord Kelvin|William Kelvin]] distinguished between primary and secondary (''natural'') causes. A ''primary cause'' was a ''first cause'' to explain singularities.<ref name="skeptics">{{Cite book

|quote=Apart from the obvious fact that no one observed [the origin of the universe], scientists think of the Big Bang as a singularity in the past, an unrepeatable event;...}}</ref> and that has no ''natural'' explanation. Most frequently the term is used in connection with the origin of the [[universe]]. When scientific principles were first being developed into the [[scientific method]], scientists like [[Francis Bacon]], [[Johannes Kepler]], [[Isaac Newton]], and [[Lord Kelvin|William Kelvin]] distinguished between primary and secondary (''natural'') causes. A ''primary cause'' was meant to be a ''first cause'' to explain singularities.<ref name="skeptics">{{Cite book

   | author = Norman L. Geisler and Ronald M. Brooks

   | author = Norman L. Geisler and Ronald M. Brooks

   | year=1990

   | year=1990