ASTR 1110 ch.1 - Summary of Key Concepts

ASTR 1110 ch.1 - Summary of Key Concepts - Chapter 1:...

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Chapter 1: Summary of Key Concepts 1.1 Our Modern View of the Universe - What is our place in the Universe? o Earth is a planet orbiting the Sun. Our Sun is one of more than 100 billion stars in the Milky Way Galaxy . Our galaxy is one of about 40 galaxies in the Local Group . The Local Group is one small part of the Local Supercluster , which is one small part of the Universe . - How did we come to be? o The universe began in the Big Bang and has been expanding ever since, except in localized regions where gravity has caused matter to collapse into galaxies and stars. The Big Bang essentially produced only two chemical elements: hydrogen and helium. The rest have been produced by stars and recycled within galaxies from one generation of stars to the next, which is why we are “star stuff”. - How can we know what the universe was like in the past? o We can actually see into the past by studying light from distant stars and galaxies. Light takes time to travel through space, so the farther away we look in distance, the further back we look in time. Thus, when we look billions of light-years away, we see pieces of the universe as they were billions of years
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This note was uploaded on 02/27/2008 for the course ASTR 1110 taught by Professor Hornstein during the Spring '08 term at Colorado.

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ASTR 1110 ch.1 - Summary of Key Concepts - Chapter 1:...

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