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Documents Introduction to Astrophysics Lecture 17: Cosmology: the expansion of the Universe.

Slide 1 Introduction to Astrophysics Lecture 17: Cosmology: the expansion of the Universe Slide 2 Cosmology Cosmology is the study of the Universe as a whole. It attempts…

Documents Announcements Reading for next class: Chapters 21 & 22 Cosmos Assignment 3, Due Monday, April 19 1....

Slide 1 Announcements Reading for next class: Chapters 21 & 22 Cosmos Assignment 3, Due Monday, April 19  1. Astronomy Place tutorial “Measuring Cosmic Distances”,…

Documents Milky Way Galaxy. A galaxy is a group of stars, dust, and gases held together by gravity.

 A galaxy is a group of stars, dust, and gases held together by gravity. • The Milky Way is a large spiral galaxy whose disk is about 100,000 light-years wide and about…