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To understand how the bar and the spiral structures are formed dynamically by the stars orbiting: Density wave theory
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/M101_hires_STScI-PRC2006-10a.jpg/500px-M101_hires_STScI-PRC2006-10a.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/NGC_1672_HST.jpg/500px-NGC_1672_HST.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Blackeyegalaxy.jpg/500px-Blackeyegalaxy.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/52/Hubble2005-01-barred-spiral-galaxy-NGC1300.jpg/500px-Hubble2005-01-barred-spiral-galaxy-NGC1300.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/M104_ngc4594_sombrero_galaxy_hi-res.jpg/500px-M104_ngc4594_sombrero_galaxy_hi-res.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/NGC_3982_-_Hubble_space_telescope%2C_2003.jpg/500px-NGC_3982_-_Hubble_space_telescope%2C_2003.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/24/NGC_3370_Hi.jpg/500px-NGC_3370_Hi.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c6/NGC3054-hst-606.png/500px-NGC3054-hst-606.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/NGC_4414_%28NASA-med%29.jpg/500px-NGC_4414_%28NASA-med%29.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Messier51.jpg/500px-Messier51.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Messier_81_HST.jpg/500px-Messier_81_HST.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Ngc5866_hst_big.png/500px-Ngc5866_hst_big.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Ngc_1350.jpg/500px-Ngc_1350.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e4/NGC_3169.jpg/500px-NGC_3169.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/NGC_4319_I_HST2002.jpg/500px-NGC_4319_I_HST2002.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/NGC_4603.jpg/500px-NGC_4603.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/NGC_3079.jpg/500px-NGC_3079.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/46/NGC_3190.jpg/500px-NGC_3190.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/NGC_4725.jpg/500px-NGC_4725.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/NGC_1291_GALEX.jpg/500px-NGC_1291_GALEX.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/NGC_3259_by_Hubble.jpg/500px-NGC_3259_by_Hubble.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Galaxy_in_a_spin.jpg/500px-Galaxy_in_a_spin.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/80/NGC_3368_ESO.jpg/500px-NGC_3368_ESO.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/NGC_7049aa.jpg/500px-NGC_7049aa.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/17/NGC_7217_Hubble.jpg/500px-NGC_7217_Hubble.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Messier_106_visible_and_infrared_composite.jpg/500px-Messier_106_visible_and_infrared_composite.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/59/NGC1097_-_ESO_-_eso0438d.jpg/500px-NGC1097_-_ESO_-_eso0438d.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/A_wanderer_dancing_the_dance_of_stars_and_space.jpg/500px-A_wanderer_dancing_the_dance_of_stars_and_space.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Caldwell_44.jpg/500px-Caldwell_44.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/NGC_5371.jpg/500px-NGC_5371.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Messier_88_galaxy.jpg/500px-Messier_88_galaxy.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/SN1994D.jpg/500px-SN1994D.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/NGC_4622HSTFull.jpg/500px-NGC_4622HSTFull.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/60/NGC_4639.jpg/500px-NGC_4639.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/39/NGC_4314HST1998-21-b-full.jpg/500px-NGC_4314HST1998-21-b-full.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/80/M100.jpg/500px-M100.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/N4450s.jpg/500px-N4450s.jpg)
To understand how the bar and the spiral structures are formed dynamically by the stars orbiting: Density wave theory