The Galaxies.

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Presentation transcript:

The Galaxies

Description Size Number From 10^7 to 10^12 stars From from 1000 to 100000 parsecs 1 parsec = 3,262 light years Number More than 10^11

History of observation End of the 18th century : Messier - Herschel 1845 : Lord Rosse 1923 : Hubble

Spiral Barred spiral Elliptical Irregular Types Spiral Barred spiral Elliptical Irregular

Dynamics and Activities Interactions : - Near misses - Collision - Merger Starburst Active galaxies

Formation and Evolution - Just after big bang : rapid expansion of the universe - 300000 years after Big Bang : first structures - 2 billion years after the Big Bang : protogalaxies - 4 billion years after the Big Bang : mature galaxies

Larger and smaller scale structures