jonesdave116
Philosopher
- Joined
- Feb 26, 2015
- Messages
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Dupe..
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Seems there's a continuum between dormant lumps of ROCK and active lumps of ROCK....
Reality Check, Jonesdave116, Fred Burfle <snipped irrelevant gif> is not a scientific method.
A pathetic attempt to insult us when we know about the real world of comets but more likeReality Check, Jonesdave116, Fred Burfle... not a scientific method.
!Reality Check, Jonesdave116, Fred Burfle is not a scientific method.
While sublimation may be the original source of the water stored on the surface of Ceres, the correlation with the solar proton flux indicates that solar particle sputtering is the proximate agent for the temporary enhancements in the vapor production rate, allowing the exosphere to be detected telescopically.
Sol88: The research began with a 2016 Science study led by Chris Russell. The study, using GRaND data, suggested that, during a six-day period in 2015, Ceres had accelerated electrons from the solar wind to very high energies.
One way of producing a transient, standing bow shock at Ceres is a comet-like interaction of the solar wind with a cerean atmosphere that can mass load the solar wind and cause it to deflect. Once the atmosphere dissipates, there will no longer be a significant obstacle to the solar wind to form a bow shock and the electron acceleration will cease.
The point is, as Sol88 continues to demonstrate so comprehensively, that whatever "the Electric Universe" is, it isn't science.Indeed. And the point being? The same process happens at comets. A bow shock is formed where the solar wind encounters the coma. The SW is deflected. As the authors state:
I'm still failing to see your point. Is it that you want to compare a dwarf planet with a comet? A dwarf planet with a density of ~ 2.2 g/cm3? Why not just go the whole hog, and include a real planet? Mars has got ice on it. Is it a comet? Or is a comet a mini-Mars? The big difference between planets/ asteroids, and comets is the abundance of rock on the former, and the total undetectability of it on the latter. Hence their very different densities.
Still no viable mechanism for the Jet formation from the "mainstream", though they are starting to come round that the Electric Sun is the main player!
I mean collapsing cliffs exposing "bright patches" what a howler!!
Moreover, the collapse revealed the fresh icy interior of the comet, which is characterized by an albedo>0.4, and provided the opportunity to study how the crumbling wall settled down to form a new talus.
Despite multiple observations suggesting various triggering processes4,5, the driving mechanism of such outbursts is still poorly understood. Landslides have been invoked to explain some outbursts on comet 103P/Hartley 2, although the process required a pre-existing dust layer on the verge of failure.
Original Caption Released with Image:
This image layout depicts changes in the surface of comet Tempel 1, observed first by NASA's Deep Impact Mission in 2005 (top right) and again by NASA's Stardust-NExT mission on Feb. 14, 2011 (bottom right). Between the two visits, the comet made one trip around the sun. The image at top left is a wider shot from Deep Impact.
The smooth terrain is at a higher elevation than the more textured surface around it. Scientists think that cliffs, illustrated with yellow lines to the right, are being eroded back to the left in this view. The cliffs appear to have eroded as much as 20 to 30 meters (66 to 100 feet) in some places, since Deep Impact took the initial image. The box shows depressions that have merged together over time, also from erosion. This erosion is caused by volatile substances evaporating away from the comet.
Knee slappn belly laugh!
Would you like to revisit you favourite comet JD116? Perhaps you can show me, Where do you think the icy debris at the foot of cliffs has comefromgone?
[qimg]https://photojournal.jpl.nasa.gov/jpeg/PIA13862.jpg[/qimg] from the recession of icy cliffs?
Can't see any and no sublimation from the albedo >0.4 "ice".
Have another go ya mug!
like I said it's ALL you've got! Sad.
The presence of fresh exposed water ice on the cliff face is indirectly confirmed by the temporal evolution of its normal albedo. On 26 December 2015, the bright cliff was imaged again with the NAC (Fig. 1d), and the resulting normal albedo at its edge was 0.16–0.18 (50% less than ~5 months before, meaning that most of the exposed water ice had already sublimated).
Here we report the identification at infrared wavelengths of water ice on two debris falls in the Imhotep region of the nucleus. The ice has been exposed on the walls of elevated structures and at the base of the walls.
Can't see any and no sublimation from the albedo >0.4 "ice".
The temperature is within a 100–150 K range from SESAME data (Lethuillier et al. 2016) and about 90–130 K from MUPUS data (Spohn et al. 2015). Furthermore, the near-surface is likely to be a good insulator. The thermal inertia, as derived from MUPUS, is (85 ± 35) J m−2 K−1 s−1/2 (Spohn et al. 2015), to be compared with a range of 10–50 J m−2 K−1 s−1/2, derived from MIRO on board Rosetta for the overall subsurface (Gulkis et al. 2015). The interior of the nucleus is thus only weakly sensitive to variations in surface illumination, with temperatures most likely remaining below 100 K.
However, the depth at which the primitive material of 67P can be found is not well constrained. Based on one-dimensional thermal propagation models fitting the MIRO data, it has been determined that the diurnal variation in temperature is confined to the upper layer of the subsurface, with a thermal penetration depth of a couple of centimetres.
On the nucleus structure and activity of comet 67P/Churyumov-GerasimenkoActivity and its source
OSIRIS has detected the presence of a dust coma since the pronounced outburst between 27 and 30 April 2014, or even earlier (18). We detected resolved features in the coma (SM2) in long WAC exposures with the 610-nm filter (SM1) at the end of July 2014, when the comet was 3.7 AU from the Sun and the spacecraft distance was 3000 km. Most of the activity was unambiguously coming out of the transition region between the small and large lobes of the nucleus, the Hapi region, or very close to it. This was consistent with ground-based observations of coma structures over the last two orbital periods, which implied an active region at high northern (positive) latitude (19). When the spacecraft distance dropped to 100 km (resulting in a resolution of 1.8 m/pixel in NAC, 10 m/pixel in WAC), it was possible to localize the active sources by inversion of the jets. Most of the jets arose from Hapi, at about +60° latitude (Fig. 4), although we found other minor active spots on both lobes of the nucleus (SM3). This major coma feature presents a diurnal variation of intensity due to changing insolation conditions and observational geometry: A planar fan-like jet appears brighter and more focused when viewed edge-on rather than face-on.
Jesus. What an idiotic statement!
LINKMoreover, the collapse revealed the fresh icy interior of the comet, which is characterized by an albedo >0.4, and provided the opportunity to study how the crumbling wall settled down to form a new talus.
Here we report the identification at infrared wavelengths of water ice on two debris falls in the Imhotep region of the nucleus. The ice has been exposed on the walls of elevated structures and at the base of the walls.
10 April 2017 Sol88: A lie about no viable mechanism for comet jets from the mainstream.Still no viable mechanism for the Jet formation from the "mainstream", though they are starting to come round that the Electric Sun is the main player ...!
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