Top-down Structure Formation

Formation of large structures, such as galaxyConcentration of 10⁶ to 10¹² stars, dust and gas, that are gravitationally bound. Our galaxy contains ~2 × 10¹¹ stars. There are four main types of galaxies: • Elliptical
• Lenticular
• Spiral
• Irregular
superclusters or perhaps even the vast filaments and voids, prior to the formation of smaller structures such as individual galaxies. Top-down structure formationDevelopment of organized structures in the universe, ranging from galaxies to clusters to superclusters, and possibly beyond to huge filaments and voids. occurs in cosmological models with Hot Dark MatterForm of matter that does not emit light, absorb light, or otherwise interact with electromagnetic radiation. Its only interactions are gravitational and dark matter particles can clump under the force of gravity (unlike "dark energy" which is evenly distributed throughout space). The existence of dark matter has been inferred from.