... Uranus' Moon Miranda . ... The third and fourth innermost moons of Saturn were unexpectedly discovered to be gravitational "shepards." ... December 22 marks the Winter Solstice - the beginning of winter in the Earth's northern hemisphere, and the first day of summer in the south! ... In the center of the glowing red gas on the Trifid Nebula lies an open cluster of young hot stars. ... A Galaxy Gravitational Lens . ... The central galaxy happens to fall directly in the light path of the quasar. ...