American astronomers have picked up radio waves from a 'brown dwarf' - an object that is bigger than a planet but smaller than a star - for the first time. Edo Berger of the California Institute of Technology and colleagues detected the surprising signal from a nearby brown dwarf known as LP944-20 (E Berger et al 2001 Nature 410 338). The discovery could provide important insights into the nature of these mysterious bodies.
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