AST201H1 Lecture Notes - Lecture 1: Bryan Gaensler, Observable Universe, Orbital Speed

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

Document Summary

The lights of the stars we see today travel in the speed of light, which is very fast but not instantaneous. When we see the moon, we see the moon as it was one second ago because that is how fast light travels from the moon to earth. When we see our sun, we see the sun as it was eight minutes ago. Unfortunately, he did not receive any support from his peers during most of his time: then astronomer vera rubin (1928-2016) further proved the existence of the. Missing mass through her research that changed the fundamental knowledge of space for modern astronomers. Her studies consisted of observing the orbital speed of galaxies where many predicted that all galaxies should have stars spin faster closer to the centre of the galaxy, and slower when they are farther from the galaxy.