ASTR 102
American Public University System
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LAB 4 ASTR 102
- Exam (elaborations) • 4 pages • 2022
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Lab 4 
How Big is our Galaxy? 
ASTRO 102 
1 Objective 
The objective of this lab was to introduce methods that astronomers use to estimate properties of 
astronomical objects using observations. 
2 Introduction 
A variable star is a star whose brightness changes periodically. Variable stars are comprised of two 
categories, intrinsic and extrinsic variables. The luminosity of an intrinsic star changes, whereas only the 
apparent brightness of an extrinsic star changes due to changes in the amoun...
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