NASA says the Hubble Space Telescope has revealed a new twist on the Ring Nebula, a cosmic object so iconic it\'s a popular illustration for astronomy books. Hubble has revealed the true shape of the nebula, the glowing gas shroud around an old, dying, sun-like star, the space agency reported Thursday. The nebula\'s apparent ring shape is a result of perspective but the Hubble images show a more complex structure than astronomers once thought and have allowed them to construct the most precise 3-D model of the nebula. The nebula appears to be a ring because the view from Earth is looking straight into what is actually a barrel-shaped cloud of gas, astronomers said. \"The nebula is not like a bagel, but rather, it\'s like a jelly doughnut, because it\'s filled with material in the middle,\" C. Robert O\'Dell of Vanderbilt University in Nashville, said. O\'Dell leads a research team that used Hubble and several ground-based telescopes to obtain the best view yet of the iconic nebula. It will continue to expand for 10,000 years, a short phase in the lifetime of the star, the astronomers said, then will become fainter and fainter until it merges with the interstellar medium.
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