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This image combines data from four space telescopes to create a multi-wavelength view of all that remains of RCW 86, the oldest documented example of a supernova. Chinese astronomers witnessed the event in 185 A.D., documenting a mysterious "guest star" that remained in the sky for eight months. X-ray images from NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton Observatory were combined to form the blue and green colors in the image.
Arches Cluster is the densest known star cluster in the Milky Way, and is located about 100 ly away from the center of our galaxy, in the constellation Sagittarius. The radius of the cluster is approx. 1 ly. It contains about 150 young, very hot stars - many times larger & more massive than our Sun. NASA Hubble.
Sharpless 2-106, a bipolar star-forming region in Cygnus. The 'wings' of the nebula record the contrasting imprint of heat & mo-tion against a backdrop of a colder medium. Twin lobes of super-hot gas stretch outward from the central star. This hot gas creates the 'wings.' A ring of dust & gas orbiting the star acts like a belt, clinching the expending nebula into an 'hourglass' shape