File:Cometary Knots Around A Dying Star.jpg
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[edit]DescriptionCometary Knots Around A Dying Star.jpg |
English: These gigantic, tadpole-shaped objects are probably the result of a dying star's last gasps. Dubbed "cometary knots" because their glowing heads and gossamer tails resemble comets, the gaseous objects probably were formed during a star's final stages of life. Hubble astronomer C. Robert O'Dell and graduate student Kerry P. Handron of Rice University in Houston, Texas discovered thousands of these knots with the Hubble Space Telescope while exploring the Helix nebula, the closest planetary nebula to Earth at 450 light-years away in the constellation Aquarius. Although ground-based telescopes have revealed such objects, astronomers have never seen so many of them. The most visible knots all lie along the inner edge of the doomed star's ring, trillions of miles away from the star's nucleus. Although these gaseous knots appear small, they're actually huge. Each gaseous head is at least twice the size of our solar system; each tail stretches for 100 billion miles, about 1,000 times the distance between the Earth and the Sun. Astronomers theorize that the doomed star spews hot, lower-density gas from its surface, which collides with cooler, higher-density gas that had been ejected 10,000 years before. The crash fragments the smooth cloud surrounding the star into smaller, denser finger-like droplets, like dripping paint. This image was taken in August, 1994 with Hubble's Wide Field Planetary Camera 2. The red light depicts nitrogen emission ([NII] 6584A); green, hydrogen (H-alpha, 6563A); and blue, oxygen (5007A).
Image # : PR96-13B |
Date | |
Source | https://www.flickr.com/photos/44494372@N05/9458009327/ |
Author | NASA on The Commons |
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current | 08:39, 16 August 2014 | 1,805 × 2,361 (3.44 MB) | Meisam (talk | contribs) | User created page with UploadWizard |
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Author | NASA/ Goddard Space Flight Center - Space Telescope Science Institute |
Date and time of data generation | 00:00, 1 August 1994 |
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Width | 1,805 px |
Height | 2,361 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS6 (Windows) |
File change date and time | 00:00, 1 August 1994 |
Exif version | 2.21 |
Date and time of digitizing | 00:00, 1 August 1994 |
Color space | sRGB |
Unique ID of original document | C794A70CECC26E5923686C85E67ACF97 |
Date metadata was last modified | 07:01, 19 June 2013 |
Copyright status | Copyright status not set |
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