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Science/Tech
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Title: Astronomy Picture of the Day
Source: NASA
URL Source: http://antwrp.gsfc.nasa.gov/apod/ap050312.html
Published: Mar 12, 2005
Author: Robert Nemiroff (MTU) & Jerry Bonnell (U
Post Date: 2005-03-12 08:34:25 by 2Trievers
Keywords: Astronomy, Picture
Views: 75
Comments: 8

Explanation:

Don't be fooled by the familiar pattern.

The graceful spiral structure seen in this computer visualization does not portray winding spiral arms in a distant .

Instead, the graphic shows spiral shock waves in a three dimensional simulation of an accretion disk -- material swirling onto a compact central object that could represent a white dwarf star,

neutron star, or black hole.

Such accretion disks power bright x-ray sources within our own galaxy.

They form in binary star systems which consist of a donor star (not shown above), supplying the accreting material, and a compact object whose strong gravity ultimately draws the material towards its surface.

For known

x-ray binary systems the size of the accretion disk itself might fall somewhere between the diameter of the Sun (about 1,400,000 kilometers) and the diameter of the Moon's orbit (800,000 kilometers).

One interesting result of the virtual reality astrophysics illustrated here is that the simulated disk develops instabilities which tend to smear out the pronounced spiral shocks.

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#1. To: 2Trievers (#0)

The astronomy picture of tomorrow:

Jhoffa_  posted on  2005-03-12   8:45:02 ET  (1 image) Reply   Untrace   Trace   Private Reply  

Yeppers. If you get there before me, send me a t-shirt.

2Trievers  posted on  2005-03-12   8:52:19 ET  (1 image) Reply   Untrace   Trace   Private Reply  

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