What Did Medieval People Think Space Was?

From the beginnings of civilization, humans have always looked up to the heavens in wonder. Sightings of stars and planets, comets and eclipses are awe inspiring and help us to try and understand our place in the cosmos. Technological advances made just over the last few decades with larger and more powerful equipment mean that we can now probe much deeper into the unknown universe of countless galaxies, planets and stars, to understand its origin and growth. We know about pulsars, quasars, d...