The three examples of Scientific Theories are : The Big Bang Theory: demands that the universe began as a small singularity 13.8 billion years ago and extended suddenly.The Heliocentric Theory: Nicolaus Copernicus' theory illustrates that Earth travels around the Sun.The Theory of General Relativity: Albert Einstein's theory claims that large objects (like the Earth) create a malformation in space-time, which is encountered as gravity. This theory replaced one of the most famous scientific laws, Newton's Law of Universal Gravitation.