Star Formation in the Aquila Rift With colleague Ralph Shuping, I have been investigating the star formation in the W40 cluster and the Aquila Rift region. W40 is an embedded H II region, powered by a handful of late O and early B stars and located at the southwest end of the Aquila Rift. Infrared and X-ray surveys show up to 1,000 members within 20 arcminutes of the central bright sources. Many of these other sources appear to be Class II or III young stellar objects (YSOs), which together suggest an age for the region of less than a few million years. W40 is one of a handful of massive star-forming regions within 1 kiloparsec of the Sun that allow individual sources to be resolved, making it an ideal laboratory for intercomparing source characteristics within a sample of stars with the same age and birth environment.