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Lecture 18

Astronomy 1011A/B Lecture 18: astronomy chapter 18
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Department
Astronomy
Course
Astronomy 1011A/B
Professor
Prof.a
Semester
Summer

Description
Chapter 18: Contents of Universe Ordinary matter: ~ 5 Ordinary matter inside stars: ~ 0.5 Ordinary matter outside stars: ~ 4.5 Dark matter: ~ 27 (mass that emits littleno light, but whose existence we infer from its gravitational influence Dark energy: ~ 68 (source of a repulsive force causing the expansion of the universe to accelerate) We measure the mass of t
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