It has very little effect, since dust grains are so tiny. Any object will collapse under its own weight unless something stops it. The ejected envelope of an evolved star surrounding a stellar core remnant. The material that surrounds a recent supernova. This is the only phase common to all stars.
Most stars die at the end of the main sequence.
This phase lasts longer than any other phase. A white dwarf is composed primarily of carbon. The stars will gradually sink toward the centre, creating a globular cluster. The stars in it will gradually escape from the cluster, until there is no cluster left. The core temperatures decreases.