The Size of Our World

There are Millions of Living being inside our Body with life span as small as few moments. Those Few Moments, They enjoy childhood, young age, grow older and die. They re-generate, give birth to newer generation and complete their own cycle. They Live their full circle, like us!! World of those beings doesn't go beyond our internal organ they reside. They have their own world. We Humans are humongous as compared to them. How Big is Our World When We Look beyond our Earth and Sun? Are We also inside some organ of some other gigantic being?