The galaxy M63 has fluffy structured spiral arms which has given it the name “Sunflower Galaxy”. The blue glow comes from bright, young stars. Emission nebulae of hot, ionised hydrogen glow red and in between are many bands of dark dust. The stars in the outer regions of the Sunflower Galaxy orbit around the centre so quickly that, given the visible matter and assuming normal gravity, they would have to fly out into space. The fact that the stars remain in the galaxy is interpreted as an indication of invisible dark matter.
Sunflower Galaxy – M63