Birth of stars in a molecular cloud. The shroud of dust shown here in constellation Cygnus hides an exceptionally bright source of radio emission called DR21. Visible light traces reveal no evidence of what is happening in this region because of heavy dust obscuration. NASA's Spitzer Space Telescope took this image and is able to peek behind the veil of dust at one of the most massive embryonic stars in the Milky Way galaxy. This star is more than 100,000 times as bright as the Sun. The image also shows a powerful outflow of hot gas emanating from the star and bursting through the molecular cloud. (NASA)

gas to become ionized. Magnetic fields are generated, and these fields cause particles to move along the magnetic field lines but prevent the particles from moving against the magnetic field, causing the shape of the condensing molecular cloud to become distorted. since the formation of the charged particles in the densest part of the collapsing cloud is tied to the formation of the magnetic field, the two processes are linked and the magnetic field intensifies and is pulled in toward the center of the condensing cloud. The interactions between these forces are complex and may explain many of the variations in the shapes and other characteristics of condensing molecular clouds and young star systems.

Composition can also affect the way a star evolves and matures. stars that evolve from interstellar molecular clouds with higher concentrations of heavy elements tend to be cooler and a little less luminous than stars with more light elements.

Continue reading here: Stages To Main Sequence Evolution

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