ASK THE EXPERTS

Many cosmologists began their quests for the origins of the universe out of simple curiosity. The questions they ask are deceptively simple: What is the universe made of? How did it all begin? Will the universe come to an end or will it go on forever?

We want to thank everyone who sent such questions to "Ask the Experts." The response was overwhelming - over 2000 emails. Unfortunately, we could respond only to a small number of submissions, and we are not accepting additional inquiries. The answers to many questions can be found within the pages of this Web companion piece.

Our experts have responded below to several of the questions we received. We hope you enjoy the questions as well as the answers.

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