Looking for a sky event this week? Check out our full Sky This Week column.  July 17: The Moon skims south of Venus Comet 10P/Tempel (also called Tempel 2) is closing in on the Sun for an early August perihelion. It’s now undergoing some spectacular visual changes as Earth passes through the plane of the comet’s orbit. As Continue reading "The Sky Today on Saturday, July 18: Comet Tempel’s knife-edge tail" The post The Sky Today on Saturday, July 18: Comet Tempel’s knife-edge tail appeared first on Astronomy Magazine .