December 5, 2012
Day 5 of the 2012 Hubble Space Telescope Advent Calendar, one of 25 photos (eventually). Resembling comets streaking across the sky, these four speedy stars are plowing through regions of dense interstellar gas, creating brilliant arrowhead structures and trailing tails of glowing gas. The stars in these NASA Hubble Space Telescope images are among 14 young runaway stars spotted by the Advanced Camera for Surveys between October 2005 and July 2006. (NASA, ESA, and R. Sahai, NASA/JPL)

Day 5 of the 2012 Hubble Space Telescope Advent Calendar, one of 25 photos (eventually). Resembling comets streaking across the sky, these four speedy stars are plowing through regions of dense interstellar gas, creating brilliant arrowhead structures and trailing tails of glowing gas. The stars in these NASA Hubble Space Telescope images are among 14 young runaway stars spotted by the Advanced Camera for Surveys between October 2005 and July 2006. (NASA, ESA, and R. Sahai, NASA/JPL)

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