Comets are not made out of water and ice; they are made out of rock.
They discharge a plasma coma due to the rapidly changing electrical field they are moving through.
Since they spend most of their time in the outer solar system, they acquire a charge relative to that environment. As it approaches the Sun’s electrical field, it has to equalize its charge rapidly which causes the discharging we see as comet tails.
Here is an excellent video dealing with this topic.
Here is the full video playlist link:
Supporting documentation and links to all the NASA quotes, web sites, and papers used in the video can be found here:
Could Comet Elenin Discharge Enough Energy For A Pole Shift?
What most people don’t realize is that we have had several minor pole shifts within the last 18 months.
In fact the Earth’s axis has been so unstable recently that cover stories such as an acceleration in the drift of the magnetic field have had to be invented.
More to say on this in the next post but for now lets examine what a comet is really made of.