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15
Cosmology
15.1 INTRODUCTION
Have you ever looked out your window on a clear, star-lit night and wondered: What
is out there and how did it get there? I know that I did when I was a teenager. It was
that intense curiosity about what was in the heavens and how it all began that caused
me to become a scientist. If you have never experienced that clear, star-lit night, you
have missed one of the most beautiful and profound aspects of nature. The darker
your surroundings, the better, since it will allow you to see many more stars and
experience the true beauty of the heavens.
When I looked out at the universe that star-lit night, our knowledge ...