Western Washington University   College of Sciences and Technology   Physics/Astronomy Dept.   Bellingham, WA USA
 
ASTRO 101

Analemma
Asteroids
Aurora
Big Bang
Black Holes
Bode Titius
Brightest Stars
Comets
Constellations
Coordinates
Cosmology
Cruithne
Dark Matter
Eclipses
Galaxies
Historical
HR Diagram
Hubble's Law
Intelligent Life
Kepler's Laws
Leap Year
Light Waves
Lunar Libration
Messier Objects
Meteors
Milky Way
Moon
Moon Phases
Planets
Precession
Rainbows
Redshift
Seasons
Stellar Evolution
Stardust
Sun & Fusion
Telescopes
Tides
Time of Day
Twilight
Zodiac
 
Edwin Hubble Explains Galactic Redshifts
Hubbles Law   Hubble's Constant   Raisin Pudding   Activity Lab   Galactic Recession   Galactic Redshifts   Exam

The law of expansion was first formulated by Edwin Hubble in 1929. Hubble compared the distances to galaxies to their redshift, and found a linear relationship. He interpreted the redshift as being caused by the receding velocity of the galaxies. The recession is interpreted as an overall expansion of the Universe.