Reality Check
Penultimate Amazing
There is no contradiction (just no assumption that J. Sunshine is ignorantI thought for a second there you'd see the contradiction between J.Sunshine's not enough surface ice to account for Tempels 1 activity
Not enough surface ice to provide the water = there must be ice under the surface providing the extra waterThis is blindingly obvious, Sol88. No astronomer is ignorant enough to think that comets are rock. They know that comets are less dense than water. Theses authors measured water ices inside and on Tempel 1. Thus the only valid source for the water in outgassed material is on or under the surface. Not enough water ice on the surface means that there is a bigger supply under the surface !
.Citing an irrelevant paper that is not about water ice is just wrong, Sol88. What makes it worse is that it was not in the post where you are trying to bring up this imaginary contradiction.
Dust coma morphology in the Deep Impact images of Comet 9P/Tempel 1
We present an overview of the dust coma observations of Comet Tempel 1 that were obtained during the approach and encounter phases of the Deep Impact mission. We use these observations to set constraints on the pre-impact activity of the comet and discuss some preliminary results. The temporal and spatial changes that were observed during approach reveal three distinct jets rotating with a 1.7-day periodicity. The brightest jet produces an arcuate feature that expands outward with a projected velocity of about 12 m s−1, suggesting that the ambient dust coma is dominated by millimeter-sized dust grains. As the spatial resolution improves, more jets and fans are revealed. We use stereo pairs of high-resolution images to put some crude constraints on the source locations of some of the brightest features. We also present a number of interesting coma features that were observed, including surface jets detected at the limb of the nucleus when the exposed ice patches are passing over the horizon, and features that appear to be jets emanating from unilluminated sources near the negative pole. We also provide a list of 10 outbursts of various sizes that were observed in the near-continuous monitoring during the approach phase.
You are obviously not understanding what you cite, Sol88: NASA - Deep Impact Team Reports First Evidence of Cometary Ice
(my emphasis added)Based on this spectral data, it appears that the surface ice used to be inside Tempel 1 but became exposed over time. The team reports that jets – occasional blasts of dust and vapor – may send this surface ice, as well as interior ice, to the coma, or tail, of Tempel 1.
And
Ice Exists on Surface of Comet, But Most Lies Deeper
(my emphasis added)"These new findings are significant because they show that our technique is effective in finding ice when it is on the surface and that we can therefore firmly conclude that most of the water vapor that escapes from comets is contained in ice particles found below the surface," said Deep Impact Principal Investigator Michael A'Hearn of the University of Maryland.
Last edited:



Obviously 
