The mission of Atlantis, the shuttle that launched last May to make the final adjustments to the Hubble, is already paying dividends. The shuttle's astronauts installed the Wide Field Camera 3 (WFC3), which snapped this photo of the "Bug" or "Butterfly" planetary nebula.
According to NASA, the star at the center of the nebula first evolved into a huge red-giant star, with a diameter of about 1,000 times that of our Sun. It then lost its extended outer layers. Some of this gas was cast off from its equator at a relatively slow speed, perhaps as low as 20,000 miles an hour, creating the doughnut-shaped ring. Other gas was ejected perpendicular to the ring at higher speeds, producing the elongated "wings" of the butterfly-shaped structure.
Check out the description of this photo and see others at NASA's website.
