STSCI / UNIV MD / J.P. HARRINGTON / NASA / SCIENCE PHOTO LIBRARY STSCI / UNIV MD / J.P. HARRINGTON / NASA / SCIENCE PHOTO LIBRARY
Planetary nebula. Combined X-ray and optical image of the planetary nebula BD+30-3639. A planetary nebula is a bubble of hot gas and dust, many times the size of our solar system, expanding outwards from a dying, Sun-like star. The nebula consists of the ejected outer layers of the star. The optical part of this image (orange) was obtained with the Hubble Space Telescope (HST). The hotter, X-ray emitting region (blue, centre) was imaged with the Chandra X-ray Observatory (CXO). Both the HST and CXO are telescopes in Earth orbit. BD+30- 3639 is around 5000 light years from Earth, in the constellation of Cygnus.
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