How Big is Our Universe?
'The universe is a big, big place. But how big? And how do we know?
Throughout history, humans have used a variety of techniques and methods to help them answer the questions 'How far?' and 'How big?' Generations of explorers have looked deeper and deeper into the vast expanse of the universe. And the journey continues today, as new methods are used, and new discoveries are made.'
There are numerous links to other resources also.