Astronomy
When a cloud begins to collapse
Cool or compress a molecular cloud. Compare its mass with the Jeans mass and follow the pressureless collapse clock when gravity wins.
The model and its limits
Uniform isothermal cloud for the Jeans criterion; pressureless homologous collapse as a separate limiting model. Filaments and bright central emission are illustrative, not a star-formation simulation.
Equations used in the module
Equations M_J = π^(5/2)c_s³/(6G^(3/2)√ρ); t_ff = √(3π/(32Gρ)); r/r₀ = cos²η
