APOD
M81 is a fairly large spiral galaxy, about as large as the Milky way and one of the brightest in the night sky. The yellow core of the galaxy is clearly visible, as is the nearby companion galaxy, Homberg IX. Both galaxies are viewed here through the stars in our Milky Way, as well as some highly-reflective dust clouds high above the galactic plane, which have been dubbed "integrated flux nebulae".
posted by Vecna814 at 5:49 AM
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INTERSTELLAR MEDIUM
Starting with a view of our Milky Way galaxy, the orange gas in the animation represents the interstellar medium. The bow shock is created because the heliosphere is moving through like a boat through the water, crashing through the interstellar gases. The bow shock in front of the moving heliosphere is similar to the one observed by the Hubble Space Telescope. Click for animation. Credit: NASA/Walt Feimer
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