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I think anyone with half a brain can see that the fragments in this image:
msnbcmedia.msn.com...
Don't look like the fragments in this image taken later:
farm1.static.flickr.com...
Originally posted by Phage
reply to post by mnemeth1
You said:
I think anyone with half a brain can see that the fragments in this image:
msnbcmedia.msn.com...
Don't look like the fragments in this image taken later:
farm1.static.flickr.com...
You are correct. Because they are not the same fragments. Yes, fragment "B" is seen in the Spitzer images (as I said). The fragments of fragment "B", as seen in the Hubble close up, are not the same fragments seen in the Spitzer image. They are too small to be seen and the glare of fragment "B" is too great. What is seen in the Spitzer images are larger fragments. Fragments from the original breakup in 1995 and more from 2001.
The fragments are orbiting in parallel orbits, not in a "train".
[edit on 5/14/2010 by Phage]
The above figure indicates the relative position of 59 of the known cometary fragments, as identified using the JPL/Horizons database for May 04 from 0800 - 1200 UT. Lines of motion for all fragments are indicated. For clarity only some of the fragments have been labeled.
Originally posted by PplVSNWO
If sublimating ice blow the surface is producing jets of H2O as Phage would have us believe, why is the comet not breaking apart light a waterlogged river rock in a bond fire?
Its a LINE
Yeah, I know how x-rays are produced.
Cometary outbursts of x-ray emission can only be explained by synchrotron radiation.
X-ray emission from comets has recently been observed and has had a great impact not only because the intensity of the emission was unexpected but because of the richness of the underlying physics. Even though the spectral resolution in the initial observations was not good enough to clarify the origin of such emission, nowadays it is widely accepted that X-ray emission from comets originates in charge exchange processes between the solar wind ions and the cometary coma gases.
- Source: 'Cometary X-ray emission: theoretical cross sections, etc.' by Otranto, Olson and Biersdorfer. 2008, NRC Research Website. (For PDF click on first result here)
We speculate that the observed reduction in X-ray intensity is evidence for dust fragmentation. These results support the view that cometary X-ray emission arises from the interaction between solar X-rays and cometary dust.
- Evidence for Dust Related X-ray Emission from Comet C/1995 O1 (Hale-Bopp)
So could you say that gravity is electrical in nature?
A significant problem with mechanisms involving solar wind electrons (i.e., bremsstrahlung or K-shell ionization) is that the predicted emission luminosities are too small by factors of 100–1000 compared to observations. The flux of high-energy solar wind electrons near comets is too low (Krasnopolsky, 1997; Cravens, 2000b, 2002a).
Furthermore, X-ray emission has been observed out to great distances from the nucleus, beyond the bow shock (Fig. 2), and the thermal energy of unshocked solar wind electrons at these distances is about 10 eV. No emission has ever been found to be associated with the plasma tail of a comet, which has similar plasma densities and temperatures. Finally, the new, high-resolution spectra demonstrating multiple atomic lines are inconsistent with a continuum-type mechanism or a mechanism producing only a couple of K-shell lines as the primary source of cometary X-rays. Lisse et al. (2001) tried several thermal bremsstrahlung continuum model fits to the C/1999 S4 spectrum, and Krasnopolsky and Mumma (2001) tried the same for the C/1996 B2 (Hyakutake) spectrum, but neither was successful.
But there's something going on with N3 Lulin, right now… Something very different. There's a twist in the tail! Check this out…
While imaging N3 Lulin for UT Readers, Dr. Joe Brimacombe used a negative luminance frame to take a closer look at what's going on and discovered something quite out of the ordinary. First off, you'll notice an anti-tail – quite rare in itself – but if you take a look about halfway down the ion/dust tail, you'll see a very definite twist in the structure. It it rotating? Exactly what's causing it? Torsional stress? Is it possible that the kink in the tail is an instability resulting from currents flowing along the tail axis?
The DE indicates that the comet has recently passed through a disturbance in the magnetic field carried by the solar wind, that destroyed the original plasma tail, creating a new one. The separation of the two ion tails indentified by the DE, is visible in our image as a kind of elongated and diffuse "knot" along the plasma tail.
Comets typically have two tails, one made of dust and a fainter one made of electrically conducting gas, called plasma.
"We discovered that a comet is not really a 'dirty snowball' since dirt is dominant, not ice," said Horst Uwe Keller of the Max Planck Institut für Aeronomie, Katlenburg-Lindau, Germany. "Instead of being spherical like a warm snowball, a comet nucleus is elongated. The physical structure of a comet's interior is defined by its dust content rather than its ice content."