New Scientist (31 May 1997).

PLANET´S TAIL OF THE UNEXPECTED
http://www.newscientist.com/ns/970531/nvenus.html

By Jeff Hecht, Boston

One of our neighboring planets can still pack a few surprises, it seems.
Using satellite data, an international team of researchers has found that
Venus sports a giant, ion-packed tail that stretches almost far enough to
tickle the Earth when the two planets are in line with the Sun.