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Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE !
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[quote:Anonymous Coward 60724028:MV8yNTk4OTk2XzQ1NTA4Mzc4XzExMDdDN0E3] Electric comet 67P So we know there will be no visible lightning bolts, plasma arcs of huge sparks jumping between any body in the solar system because either they are already surrounded in conductive plasma or the gas pressure is too low to allow dielectric breakdown. There is one further way for dielectric breakdown to occur in a high vacuum, that is through field emission. ( 16 pages ) http://www.classe.cornell.edu/~ib38/tmp/reading/hv_breakdown/Alpert1964.pdf Field emission is a mechanism whereby electrons can tunnel out of a material and cross a vacuum, given a high enough voltage. The voltage has a linear relationship to the gap distance and is related to the work function of the material. A typical value for a metal ( like Rosetta ) is 6E+7 V/cm, that is 60 million volts per centimetre. So now we can use this value to calculate the voltage needed to zap Rosetta from 67P, if it was possible for them to be at different potentials. Today [b]Rosetta is 9 days and 2223km from 67P[/b]. So it would take 1.333E+16 V, that is 13.33 petavolts or 13,330,000,000,000,000 V K [/quote]
Original Message
I want to use this thread to highlight news from the Rosetta comet mission.
Ten years ago the European Space Agency ( ESA ) launched the Rosetta comet chaser to rendezvous with comet 67P, go into orbit around it and land a probe on its surface.
120 Icy Patches - by last September
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 69)
thanks FBVA
Philae Phones Home
Great news, thanks F-BVFA
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 68)
Ceres fly over video
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 67)
New Coma Discovery
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 67)
Pictures MOTHER LODE !
- There are
hundreds
thousands of images from Rosetta, this post will always point to the most recent NAVCAM or OSIRIS picture. Updated several times per week. ( Thanks F-BVFA )
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 67)
Ceres Spot Shot
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 66)
Potato
Thread: Rosetta Comet Orbiter -** 120 Icy Patches ** Philae Phones Home ** Ceres Fly Over Video ** New Coma Discovery ** Picture MOTHER LODE ! (Page 66)
When the Rosetta mission is complete we will know so much more about comets, their composition and formation. Comets have been a cause of fear and fascination throughout human history, within the next few months many long standing mysteries will be solved.
K
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