Lyra, or The Harp, a constellation in the Northern Hemisphere, between Hercules and Cygnus. In mythology, it represents the lyre of Orpheus or Mercury. The constellation's brightest star is Alpha Lyrae, or Vega, the fifth brightest star in the night sky as seen from the earth. Lyra contains a double-double star, Epsilon Lyrae, and a well-known planetary nebula, the Ring Nebula.
When you think about massive, mysterious cosmic bodies like accretion disks, the water swirling around your bathtub probably isn't the first thing to come to mind. But hey, physics works the same magic on all scales.
Sunspots are peculiar dark areas that show up regularly on the surface of the sun -- and often for no reason. What causes them? What effect could these funny little spots have on the Earth?