Wednesday, May 20, 2009

εκ παραδρομης εμφανιστηκαν γελαδες...

rim og mørke heste, originally uploaded by Gummi-Neger.

κανεις δεν επια σε το υπονοουμενο.. (ελλας-γελας-αγελας)

τεσπα παρτε τις φοραδες δια τας οποιας ομιλουσε η ελληνο-βαλκυρια ελενη......
και ειναι ολες χεσμενες....

βρηκα την χεσμενη γελαδα!

originally uploaded by Toke K. A..

μια φωτογραφια απο το Βεζεν της Δανιμαρκιας, σε μιαν απαντηση του ιστοπονηματος της Αστεροεσσας....

Wednesday, May 13, 2009

Crescent Nebula: Live Fast, Die Young (Redux: NASA, Chandra, 05/13/09)

Crescent Nebula: Live Fast, Die Young (Redux: NASA, Chandra, 05/13/09)

Editor's Note: This stellar beauty is a reduz from Oct. 13, 2003. Still adding to the archives. This fast-living nebula was a "must-have" addition!

Massive stars lead short, spectacular lives. This composite X-ray (blue)/optical (red and green) image reveals dramatic details of a portion of the Crescent Nebula, a giant gaseous shell created by powerful winds blowing from the massive star HD 192163 (a.k.a. WR 136, the star is out of the field of view to the lower right).

After only 4.5 million years (one-thousandth the age of the Sun), HD 192163 began its headlong rush toward a supernova catastrophe. First it expanded enormously to become a red giant and ejected its outer layers at about 20,000 miles per hour. Two hundred thousand years later - a blink of the eye in the life of a normal star - the intense radiation from the exposed hot, inner layer of the star began pushing gas away at speeds in excess of 3 million miles per hour!

When this high speed "stellar wind" rammed into the slower red giant wind, a dense shell was formed. In the image, a portion of the shell is shown in red. The force of the collision created two shock waves: one that moved outward from the dense shell to create the green filamentary structure, and one that moved inward to produce a bubble of million degree Celsius X-ray emitting gas (blue). The brightest X-ray emission is near the densest part of the compressed shell of gas, indicating that the hot gas is evaporating matter from the shell. The massive star HD 192183 that has produced the nebula appears as the bright dot at the center of the full-field image.

HD 192163 will likely explode as a supernova in about a hundred thousand years. This image enables astronomers to determine the mass, energy, and composition of the gaseous shell around this pre-supernova star. An understanding of such environments provides important data for interpreting observations of supernovas and their remnants.

Image credit: X-ray: NASA/UIUC/Y. Chu & R. Gruendl et al. Optical: SDSU/MLO/Y. Chu et al.

Learn more/larger images:

p.s. You can see all of our Chandra photos in the Chandra Group in Flickr at: We'd love to have you as a member!

bathroom poem

Please remember don’t forget,
Never leave the bathroom wet.
Nor leave the soap still in the water
That’s a thing we never oughter

Nor leave the towels about the floor
Nor keep the bath an hour or more
When other folks are wanting one
Please don’t forget – it isn’t done.

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