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NASA Image Of The Day

A Chameleon Sky
NASA Image Of The Day
The sands of time are running out for the central star of this the Hourglass Nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a sun-like star's life occurs as its outer layers are ejected and its core becomes a cooling, fading white dwarf. In 1995, astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae, including the one above. Here, delicate rings of colorful glowing gas (nitrogen-red, hydrogen-green, and oxygen-blue) outline the tenuous walls of the 'hourglass.' The unprecedented sharpness of Hubble's images revealed surprising details of the nebula ejection process and may resolve the outstanding mystery of the variety of complex shapes and symmetries of planetary nebulae. Image Credit: NASA, WFPC2, HST, R. Sahai and J. Trauger (JPL)...
02 Sep 2010
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Welcome to Walter Roach's umbrella site PDF Print E-mail
Written by Walter Roach   
Sunday, 15 February 2009 00:00
Welcome! Life has become so complex that an umbrella site to shelter all of the connections in Walter's life in one place became imperative. Details will come in time.
Last Updated on Monday, 16 February 2009 19:37
 
Walter Roach at School PDF Print E-mail
Written by Administrator   
Sunday, 15 February 2009 20:18
Mister Walter Roach teaches sixth grade at Norwood Creek Elementary School, in the Evergreen School District. The grade book is available for parent and student perusal at http://no.schoolloop.com, as well as the Norwood Creek home page by Mr. DeGuara, the principal.
Last Updated on Monday, 16 February 2009 19:40
 

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