AST201H1 Lecture Notes - Lecture 10: Harvard College Observatory, Inverse-Square Law, Stellar Classification

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Bryan Gaensler

Document Summary

The amount of light we receive from a star falls with the square of its distance. This is called the inverse square law of light: check slides for the image. Amount of light goes down with the square of the distance. Edward pickering and the harvard college observatory computers computers not meaning modern day ones. Took massive amount of informaion about stars and systemaically categorized it all. Began with taking spectra and grouped them into similar groups, labeling them alphabeically: but these leters didn"t have any meaning at the ime. No physical understanding of what this meant.