Types of Galaxies Spirals (77%) Ellipticals (20%) Irregulars (3%) National Optical Astronomy Observatory images.

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Presentation transcript:

Types of Galaxies Spirals (77%) Ellipticals (20%) Irregulars (3%) National Optical Astronomy Observatory images

a: NASA/Hubble Space Institute; b: Robert Gendler; c: Anglo- Australian Observatory

(a)NASA; (b) Royal Observatory, Edinburgh

a: J. D. Wray, McDonald Observatory; b, c: 1999 Princeton University Press/Zsolt Frei and James E. Gunn

Closer Galaxies move away from us Farther Galaxies move away from us faster

Hubble’s Constant Tells Age: H 0 = Velocity/Distance = 1 / Time Hubble’s Law: Velocity = H 0 x Distance