Hover your mouse over each blue dot for the name of the object, or click on the dot for a detail page. This map was created using the all-sky hydrogen-alpha map produced by Douglas Finkbeiner from data collected by the WHAM, VTSS and SHASSA hydrogen-alpha surveys.
The large bright cloud is the 1700 year old supernova remnant RCW 89 (SNR 320.4-01.0), which appears to be part of the OB association Circinus OB1 located at a distance of about 3000 parsecs in the inner galaxy. Nearby at about the same distance are RCW 87 and RCW 88. RCW 87 is called the Black Window nebula because of its appearance in infrared.