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Lecture 4

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Department
Astronomy
Course
ASTR 1P01
Professor
Bozidar Mitrovic
Semester
Fall

Description
Friday September 14, 2012 Astronomy Lecture 4: - 1 light-year (LY) = the distance which light travels in one year = 63,000 AU = 10*13 km - circles of the star = the amount of energy being produced by the star - The stars occur in clusters (from the observation of young newly formed starts we know that they are also born in clusters) - Associations: 10 - 100 stars - Open Clusters: 100 - 1000 stars - Globular Clusters: 100,000 – 1,000,000 stars - we live in a disk of stars - the milky way galaxy (our galaxy): - Diameter of the disk is about 100,00 LY - the number of stars: the estimate is that it
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