Camelopardalis, or U Cam for short, is a star nearing the end of its life. As stars run low on fuel, they become unstable. Every few thousand years, U Cam coughs out a nearly spherical shell of gas as a layer of helium around its core begins to fuse. The gas ejected in the star’s latest eruption is clearly visible in this picture as a faint bubble of gas surrounding the star.
Hubble Telescope Reveals Farthermost View into the Universe: Scientific American / Si tratta dell'immagine XDF (eXtreme Deep Field) ovvero un quadratino di cielo piu' piccolo della luna fotografato da Hubble per 10 anni rivela, combinando le foto, com'era l'universo 13 miliardi di anni fa.