WASHINGTON, Oct 18 (Reuters) - In 1995, astronomers confirmed the discovery for the first time of a brown dwarf, a body too small to be a star and too big to be a planet - sort of a celestial tweener.

The Hubble Space Telescope has shown that dark matter is concentrated within the core of a nearby dwarf galaxy, a finding that rushes to the rescue of the Standard Model of cosmology. This model ...