A glimpse of what is believed to be the most powerful star ever detected--a dynamo that pumps out 10 million times more energy than the sun and yet can't be seen with the naked eye-- is shown in this image captured by the Hubble Space Telescope. A nebula, produced by violent eruption on the pistol star, appears as a pinkish cloud surrounding the star. (AP Photo/Don F. Figer, UCLA, NASA)