... Mt Anatahan Erupts . ... A solar prominence is a cloud of solar gas held just above the surface by the Sun's magnetic field. ... Dust usually shows its presence by blocking out light emitted from stars or nebulae behind it, sometimes creating the illusion of a horse's head or a sombrero hat. ... Centaurus A: X-Rays from an Active Galaxy . ... Astronomers were not disappointed, as Centaurus A's appearance in x-rays makes its classification as an active galaxy easy to appreciate. ...