... But hold on. Now we see a claimed "announcement" of water on the surface. Therefore, before I have a chance to change my own prediction of NO WATER ICE ON THE SURFACE (beyond a trivial frost as on Tempel 1), here are my predictions as they stood just a couple of hours ago. Expect some modest changes, but no wholesale retractions based on new info.
• likelihood of a hot and dry surface ("hot," as in the familiar lexicon of comet science)
• no layers's of ice exposed beneath the surface, despite the requirements of standard theory
• no ice at the source of jets, not even where the most energetic jets are active
• electric discharge as the essential contributor to the comet's increasing activity
• abundance of unexplained rocky debris on the surface, as seen on asteroids, including sharp edged boulders exhibiting no ices.
• visible electrical erosion of the surface in the fashion of electrical etching of surface materials and electric discharge machining (edm)
• surface electrochemically transformed and burned black by this discharge activity, as in laboratory experiments
• focused glow discharge enigmatically moving across the surface during the course of the Rosetta observations
• useful comparisons of this activity to the moving electrified plumes of Jupiter's moon Io and Saturn's moon Enceladus
• electric fields configuring and reconfiguring layers of dust on the surface, despite the absence of an atmosphere
• removal of “astonishing,” complex crystalline molecules from the surface, with comparisons to materials on planets and moons, likely including Mars or Earth, or both.
• no appreciable “stardust,” the long-presumed primeval matter of comets
• no support for the long-presumed "compositional zoning" in textbook solar system history and comet theory
• useful comparison of dust configurations on the surface to formations seen in laboratory experiments with electric fields acting on layers of dust
• x-ray and ultraviolet emissions exceeding any scientific predictions just 20 years ago
• evidence for electrochemical production of hydroxyl and/or water by electrical action on surface silicates and clays
• evidence for production of water and/or hydroxyl by electrical activity in the coma
• unexpected negative ions close to the nucleus
• improbable hydrogen cloud gathered and held in place at the outer regions of the coma
• additional electrochemical transactions in the coma adding to diverse chemistry, ranging from CO2 to methane, alcohol, cyanide, and more
• relationship of comet flaring to arrival of charged particles from solar outbursts
Add the POSSIBILITY of a break-up of the nucleus in response to a solar outburst, though that’s not something I'd hang a hat on.
David Talbott