How does the time needed for stars to form depend on the mass of the star? Is it longer, shorter, or what for massive stars compared to low mass stars?|||Stars form inside dense concentrations of interstellar gas and dust known as molecular clouds. These regions are extremely cold, just above absolute zero. The deep cold also causes the gas to clump. Star formation is often triggered by an external shock wave, for instance an exploding supernova. When the density reaches a certain point, the cloud collapses under their own weight.
Such clouds typically have masses around 10^4 solar masses. As the core is denser than the outer cloud, it collapses first. Quickly they fragment into clumps around half a lightyear in size and 10 to 50 solar masses in mass. These clumps then form into hundreds of protostars.
The whole process takes about 10 millions years.
High-mass stars build up in the central parts of clouds. They begin to form in the early phases of cluster formation and continue to grow at a high rate until the available gas is exhausted. Lower mass stars tend to form at later phases, when a high mass stars expel the dust around them, creating new shock waves and density pockets.
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