It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
This film explores how our models of the solar system have changed over the centuries.
The ancient Greeks visualised the Earth as being at the fixed centre of perfect, revolving spheres bearing the moon, sun and stars. The only problem was the presence of wanderers ("planetos" in Greek) that meandered to and fro across the sky – which we now know to be planets.