Brown dwarfs: a second Pleiades candidate. (brown dwarf discovered in Pleides star cluster)(Astronomy)(Brief Article) From: Science News | Date: September 23, 1995 | COPYRIGHT 1995 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright information

If only it had more mass, a brown dwarf could be a star.

A star forms when a cloud of gas and dust undergoes gravitational collapse, becoming hotter and denser at its core. Eventually, that core grows hot enough to ignite and sustain a powerful energy source--the fusion of light nuclei into heavier ones.

A brown dwarf arises from the same raw material, but its lower mass and weaker gravitational contraction prevent it from attaining a high enough core temperature to burn nuclear fuel steadily. Thus, when gravitational contraction comes to a halt, a dwarf is doomed to slowly ...

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