The long streamer (about 107 km long; density about 10-18 atm) behind the comet head. Type I Tails are straight (ionic tails): Type II Tails are curved (dust tails, little or no charge).
We can see a comet head-on (its tail will look short) or on its side (the tail will look long).
Explain that sometimes we cannot see the comet, because it is behind the Sun.
 See also: Heat, Elements, Distance, Hydrogen, Helium
  
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