1）OK, we've been talking about how throughout history it was often difficult for people to give up the ideas which have long been taking for granted as scientific truth even if those ideas were false.In the......for example, the extinction between the solar system and universe weren't clear until modern times.The ancient......believed that what we called the solar system was ,in fact,the entire universe and what universe was......
2)......means earth ......So the......view holds the sun ,the planet,the stars all revolve around the sun,which was stationary.Of course,we now know the planets including earth revolves around the sun and solar system is only a tiny part of the universe.So why did ancient ......believe that the earth was the center of the universe.Well,it makes sense to them.
3)Observations of sky made this appear as the sun ,the moon and stars all revolve around the earth every day.While the earth itself stayed the......one place.And this view was supported by the......about the original structure of universe.It was presented in the works of well known phylosophers as it was released 4 century BC.......continue to......western thought for almost thousand years until 17 century.
4）Now what's especially interesting is that when ......observations were made,that's seen to be inconsistent with......century......The ancient ......not really consider ......theories.It was so......so sensible that the earth was the center of universe ......found ways to explain those seemingly inconsistent phenomeno within......
5)The ......century theory said that planets were moved around the earth in one direction.However,a strong ......notice that times several planets since starting moving in one direction and started moving backward in the orbit around the earth.And they ......the theories that these planets themselves moved in small circles called......as they traveled one year.
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