He explains that angular momentum caused the gas and dust to flatten into a disc, which led to the formation of planets orbiting the sun. Galaxies, similar to the solar system, also exhibit ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

At first the circumstellar disk is in a phase called an accretion disk, where mass is transported inward toward the star and angular momentum is transported outward. Planet formation likely occurs ...