It is often said that the reason why we “know” the Big Bang took place is because the Universe is expanding and if time were played backwards then everything would have started from the same point at the same moment in time. That moment, when everything started moving apart, is what we call the Big … Continue reading Why believe in the Big Bang?
Astronomy versus Cosmology
The word "astronomy" means the arrangement of the stars but we apply it to the arrangement of the entire Universe, not just stars. It is an observational science, since experiments are difficult to perform on solar systems and galaxies - let alone the entire Universe. Cosmology, on the other hand, is more philosophical and is … Continue reading Astronomy versus Cosmology
Mr Tarrant's physbang 'blog 