Jespersen, James

Discusses the aspects of our universe that we do not see and how they were discovered.

Discusses the theories advanced over the past several hundred years explaining the nature of the universe.

Explores the ways in which scientists can find the age of objects, using processes like carbon dating, tree-ring dating, and potassium-argon testing, and shows how knowing the age of archeological finds is an important part of learning about the Earth's past.