Some nebulae may be metal deficient and this could affect the properties of the planets and stars that form from them. There are individual planetary properties that are found in the Solar System that include the backward rotation of Venus, the tilted orbital plane of Pluto, the retrograde orbital direction of some moons, and the highly tilted rotational axes of Uranus and Pluto. These properties are not necessarily duplicated in other systems since they are considered to be the product of cosmic accidents. Normal stars range in mass from approximately 0.1 solar masses to 50 solar masses. The low mass stars are the most common, while the high mass stars are the rarest.
Open clusters consist of a few, loosely bound young stars that win dissipate with time.
Open clusters are found in the galactic plane and are amorphous in shape. Globular clusters are tightly bound, spherically shaped collections of over 10,000 stars. They are located throughout the galactic halo, rarely being found in the galactic plane. The stars that make up globular clusters are older than those that make up open clusters are. In the interstellar clouds the temperatures are cooler, around 100K in diffuse clouds and 50K in the densest clouds.