... Accretion Disk Binary System . ... Our Sun is unusual in that it is alone - most stars occur in multiple or binary systems. ... 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! ... Hot Stars in the Trifid Nebula . ... A Galaxy Gravitational Lens . ... December . ...