... M4 is a globular cluster visible in dark skies about one degree west of the bright star Antares in the constellation Scorpius. ... Light Bridges on the Sun . ... Known as light bridges, these structures may form as large sunspot groups decay. Above, one of the sharpest photographs of the Sun ever taken shows two such light bridges that appeared late last month. Antares and Rho Ophiuchi . ... Three major sources contribute to the far-infrared sky: our Solar System, our Galaxy, and our Universe. ...