Astronomers Find New 'Runaway' Stars
     By ANDREA THOMPSON, Space.com

A total of 14 young stars racing through clouds of gas like bullets, creating brilliant arrowhead structures and tails of glowing gas, have been revealed by NASA's Hubble Space Telescope.  They represent a new type of runaway stars, scientists say.  The discovery of the speedy stars by Hubble, announced here today at the 213th meeting of the American Astronomical Society, came as something of a shock to the astronomers who found them.
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Resembling comets streaking across the sky, these four speedy stars are plowing through dense interstellar gas, creating brilliant arrowhead structures called bow shocks. "We think we have found a new class of bright, high-velocity stellar interlopers," Raghvendra Sahai of NASA's Jet Propulsion Laboratory said Tuesday.