Astronomy Picture of the Day . ... Its visible surface appears to be carpeted with tens of thousands of magnetic north and south poles joined by looping field lines which extend outward into the Solar Corona. ... Our Milky Way galaxy appears to be surrounded by a halo of gamma rays. ... Where did these two irregular moons of Uranus originate? Last week two previously undiscovered moons of the distant gas planet were confirmed, the first in irregular orbits. ... M31: The Andromeda Galaxy . ...