单词:protoplanetary nebulae
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ANNOUNCER: EXPLORATIONS -- a program in Special English by the Voice of America. (MUSIC) Today, Richard Rael and Tony Riggs tell the story of American astronomer Edwin Hubble. He changed our ideas about the universe and how it developed. Edwin Hubbl
EXPLORATIONS - Edwin Hubble Changed Our Ideas About the Universe and Its Birth EXPLORATIONS -- a program in Special English by the Voice of America. Today, Richard Rael and Tony Riggs tell the story of American astronomer Edwin Hubble. He changed our
By Marilyn Christiano Broadcast: December 23, 2003 (THEME) ANNOUNCER: EXPLORATIONS -- a program in Special English by the Voice of America. (MUSIC) Today, Richard Rael and Tony Riggs tell the story of
EXPLORATIONS - Edwin Hubble Changed Our Ideas About the Universe and Its BirthBy Marilyn Rice Christiano Broadcast: Wednesday, November 29, 2006 ANNOUNCER: EXPLORATIONS -- a program in Special English
Look closer and there is something strange about this gas and dust. There're patches where it appears to glow. These bright glowing clouds are called nebulae. And along with the Orion Nebula, our Milky Way has some spectacular examples, the Eagle Neb
Even for NASA nebulae are too far away to visit, so they've built one of their own here on earth, 40 years ago scientists peered into the clouds of dust and gas created from the remains of stars, and to their surprise, found not just elements but org