The other is a magnetic tail.
The debris tail is really a trail of ejecta from the comet that is not as dense as the primary body.
The above pic comes from astro-tom.com
This is a model that explain the interactions of the universe without gravity. This is not a decay model, It is an interactive information model. Inorder to realize a need for a new model requires disproving certain understandings that permiate cosmology. A field (E) cannot equal a scalar (mass) * a vector (C) ^2. It also describes baryonic expression of information. Comments are welcome, Anonymous comments with non-relevant links will not be posted.