Thor’s Hall

Thoughts on things that catch my interest

Archive for November 7th, 2009

November 07, 2009 By: Thor Category: USMC No Comments →

Valour IT fundraising is coming into the home stretch here. The auctions have begun, and can be found here .

Some one of a kind articles are on this site. All the proceeds to to Valour IT so, do some Christmas shopping.

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A Chameleon Sky

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)
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