n-a-s-a:

M51: The Whirlpool Galaxy
Image Credit & Copyright: Marco Burali, Tiziano Capecchi, Marco Mancini

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M51: a galáxia do rodamoinho

M51: The Whirlpool Galaxy
http://www.star.ucl.ac.uk/%7Eapod/apod/ap120602.html

Explanation:
Follow the handle of the Big Dipper away from the dipper’s bowl until you get to the handle’s last bright star. Then, just slide your telescope a little south and west and you might find this stunning pair of interacting galaxies, the 51st entry in Charles Messier famous catalogue. Perhaps the original spiral nebula, the large galaxy with well defined spiral structure is also catalogued as NGC 5194. Its spiral arms and dust lanes clearly sweep in front of its companion galaxy (top), NGC 5195. The pair are about 31 million light-years distant and officially lie within the angular boundaries of the small constellation Canes Venatici.

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Big Dipper Castle
http://www.star.ucl.ac.uk/~apod/apod/ap050218.html

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Whirlpool Galaxy Genesis - M51a 
http://www.youtube.com/watch?v=H5KXl4YORYo

Descrição:
Enviado por CumputerPhysiscsLab em 18/08/2008
This Physics Simulation tries to find out the M51-a Galaxy Evolution. One big Black Hole in the center of NGC 5194 holds the spiral dynamics while another lighter black hole flies near the big one and is captured in a circular orbit. On the way nearby stars form the satellite galaxy NGC 5195.

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