... Southwest Mercury . ... The planet Mercury resembles a moon. ... Mercury is larger than most moons but smaller than Jupiter's moon Ganymede and Saturn's moon Titan. ... Yes, it's Valentine's Day (!) and looking toward star cluster NGC 346 in our neighboring galaxy the Small Magellanic Cloud, astronomers have noted this heart-shaped cloud of hot, x-ray emitting gas in the cluster's central region. The Eagle Nebula from CFHT . ... Comet NEAT Approaches the Sun . ... The Earth moves around the Sun. ...