Birth of galaxies, artwork. Illustration depicting the two possible ways in which galaxies are thought to form. On the left is the bottom-up scenario, in which galaxies are built from smaller building blocks. Small gas clouds collide under gravity to create a large, galaxy-sized structure. Individual cloudlets within this structure then condense into stars, forming a galaxy of stars. On the right is an alternative scenario, the top-down model. Here, galaxies are born from initially much larger cloud structures. These gradually fragment, with the individual fragments then forming into galaxy-sized objects. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Garlick, Mark |
Taille de l’image : | 4126 px × 5059 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |