Planets also have 'tails' in that sense as well.<p>Source: <a href="http://en.wikipedia.org/wiki/Bow_Shock" rel="nofollow">http://en.wikipedia.org/wiki/Bow_Shock</a><p>Also, here is the original NASA.gov article that the article is quoting:<p><a href="http://www.nasa.gov/content/nasa-s-ibex-provides-first-view-of-the-solar-system-s-tail/" rel="nofollow">http://www.nasa.gov/content/nasa-s-ibex-provides-first-view-...</a>