Geek Fact for September 11th

In 1877, English mathematician and astronomer James Jeans was born.

One of Jeans’ major discoveries, named Jeans length, is a critical radius of an interstellar cloud in space. It is a function of the temperature and density of the cloud as well as the mass of the particles composing the cloud. A cloud that is smaller than its Jeans length will not have sufficient gravity to overcome the repulsive gas pressure forces and condense to form a star. A cloud that is larger than its Jeans length will collapse.

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