AST-L2-ch2__3

# AST-L2-ch2__3 - Planets Stars and Galaxies Prof David Lind...

This preview shows pages 1–3. Sign up to view the full content.

1 AST 1002 Planets, Stars and Galaxies Section 1 -- MW 3:35-4:50 pm; Section 2 -- MW 5:15-6:30 pm Prof. David Lind, FSU Physics http://www . phy s i c s. f u edu/u er / Li nd/A S T1002/defau l t htm ass webs te –has sy ll abus , hedu e et c. Today’s Lecture: “Light: the Starry Messenger” Understand light and temperature Understand the interaction of light and atoms Moving sources: the doppler effect Review Scientific Method (Galileo) Based testing and experimentation Make a model (hypothesis or theory) Test and modify the model by comparing with experiments and observations of the real world A dynamic, changing process. Metric units Use Meters ( m ) and kilometers ( km ) 1 meter = 3.281 feet Kilometer = 1000 meters = 10 3 meters = about 0.6 miles Astronomical Unit ( AU ) 1AU = 150 million kilometer = average distance from the Earth to Sun Lightyear ( LY ) 1LY = 9.47x1012 km 1013 km = the distance light travels in 1 year Speed of Light ( c ) = 3 x 10 8 m/s in a vacuum 186,000 miles/second Remember to do the on li ne qu z under announ ements at First measurement of the Speed of Light – Ole Romer (1670s) -- German Astronomer studying the moons of Jupiter. -- found that the orbits were “late” when observed form the far side of our orbit.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 Light as Electromagnetic Waves -- all electromagnetic radiation (composed of oscillating electric and magnetic fields) travels at a single speed through space, called the speed of light:
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 10/13/2011 for the course AST 1002 taught by Professor Gerstein during the Spring '08 term at FSU.

### Page1 / 7

AST-L2-ch2__3 - Planets Stars and Galaxies Prof David Lind...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online